Chemistry: Find the element on the periodic table of elements. metallic period 4 and has 20 electrons use the atomic number of the mystery element for the answer

Find the element on the periodic table of elements., №13338528, 26.12.2020 07:12

Physics

1. who first published the classification of the elements that is the basis of our periodic table today? 2. by what property did mendeleev arrange the elements? 3. by what property did moseley suggest that the periodic table be arranged? 4. “the properties of the elements repeat periodically” defines the 5. what is a period and how many are there in the periodic table? 6. what is a group (also called a family)? how many are there in the periodic table? 7. state the number of valence electrons in the following: element valence electrons magnesium

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P Answered by PhD

5

That particular group of elements is reffered to as the "Noble Gasses"--a title that comes from the fact that these gases are very "secure" and don't mix well with other elements.

Physics

1. who first published the classification of the elements that is the basis of our periodic table today? 2. by what property did mendeleev arrange the elements? 3. by what property did moseley suggest that the periodic table be arranged? 4. “the properties of the elements repeat periodically” defines the 5. what is a period and how many are there in the periodic table? 6. what is a group (also called a family)? how many are there in the periodic table? 7. state the number of valence electrons in the following: element valence electrons magnesium

Step-by-step answer

P Answered by PhD

5

That particular group of elements is reffered to as the "Noble Gasses"--a title that comes from the fact that these gases are very "secure" and don't mix well with other elements.

Chemistry

1. what is the state of water at room temperature? a. solid b. liquid c. gas d. plasma 2. an ion is a charged particle that is formed when a. an atom gains electrons b. an atom loses electrons c. both a and b d. none of the above 3. a gas can be referred to as having: a. indefinite volume and shape b. definite shape and volume c. indefinite shape and definite volume d. indefinite volume and definite shape 4. what is the change of state from a solid directly to a gas called? a. condensation b. evaporation c. both a and b d. sublimation 5. what is

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P Answered by Master

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1. B. Liquid
2. C. both A & B
3. C. Indefinite shape and definite volume
4. D. Sublimation
5. Its gotta either be B or D its most likely D
6. A. Neutron
7. D.12
8. C. Ground State
9. C. Synthesis reaction
10. D. None of the above
11. Both A and C
12. A. 2
13. A. Element
14. A. Cu
15. D. Periods, Groups
16. B. Metals, Non-metals
17. A. F
18. D. None of the above
19. Either B or D
20. B. H-2.06% S-32.6% O-65.3%
21. A. Na2SO4
22. C. Combustion reaction
23. if I'm correct it should be C. Nitrogen Bromide
24. Sorry not sure what the answer is but your welcome I hope the rest of theses help!!

Chemistry

1. what is the state of water at room temperature? a. solid b. liquid c. gas d. plasma 2. an ion is a charged particle that is formed when a. an atom gains electrons b. an atom loses electrons c. both a and b d. none of the above 3. a gas can be referred to as having: a. indefinite volume and shape b. definite shape and volume c. indefinite shape and definite volume d. indefinite volume and definite shape 4. what is the change of state from a solid directly to a gas called? a. condensation b. evaporation c. both a and b d. sublimation 5. what is

Step-by-step answer

P Answered by Specialist

25

1. B. Liquid
2. C. both A & B
3. C. Indefinite shape and definite volume
4. D. Sublimation
5. Its gotta either be B or D its most likely D
6. A. Neutron
7. D.12
8. C. Ground State
9. C. Synthesis reaction
10. D. None of the above
11. Both A and C
12. A. 2
13. A. Element
14. A. Cu
15. D. Periods, Groups
16. B. Metals, Non-metals
17. A. F
18. D. None of the above
19. Either B or D
20. B. H-2.06% S-32.6% O-65.3%
21. A. Na2SO4
22. C. Combustion reaction
23. if I'm correct it should be C. Nitrogen Bromide
24. Sorry not sure what the answer is but your welcome I hope the rest of theses help!!

Chemistry

20 match the alien matters with the correct on on earth: periodic table group 1 group 2 group 13 group 14 group 15 group 16 group 17 group 18 1 h/gs 1.008 2 he/ 4.003 3 li/ 7.941 4 be/ 9.012 5 b/ 10.811 6 c/ 12.010 7 n/at 14.006 8 o 15.999 9 f/ 18.998 10 ne/ 20.179 11 na/so 22.989 12 mg/ 24.305 13 al/lm 26.981 14 si/ 28.085 15 p/ 30.973 16 s/ 32.065 17 cl/ms 35.453 18 ar/ 39.948 19 k/ 39.098 20 ca/ 40.007 skip 21 - 30 31 ga/ 69.723 32 ge 72.64 33 as/ 74.921 34 se/ 78.96 35 br/ 79.904 36 kr/ 83.8 metals metalloids nonmetals **galactic element clues**

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P Answered by Specialist

34

H=Gs, Li=Me, Na=So, K=Bn, Be=Am, Mg=A, Ca=Bo, B=Sc, Al=Lm, Ga=Sk, C=Or, Si=Co, Ge=Ik, N=At, P=Fw, As=Ki, O=Bt, S=Re, Se=Uv, F=T, Cl=Ms, Br=Lq, He=Fl, Ne=Lg, Ar=Nb, and Kr=Sp.

I may skipped one by mistake, let me know if this answers everything or if you need any other help with it.

Chemistry

20 match the alien matters with the correct on on earth: periodic table group 1 group 2 group 13 group 14 group 15 group 16 group 17 group 18 1 h/gs 1.008 2 he/ 4.003 3 li/ 7.941 4 be/ 9.012 5 b/ 10.811 6 c/ 12.010 7 n/at 14.006 8 o 15.999 9 f/ 18.998 10 ne/ 20.179 11 na/so 22.989 12 mg/ 24.305 13 al/lm 26.981 14 si/ 28.085 15 p/ 30.973 16 s/ 32.065 17 cl/ms 35.453 18 ar/ 39.948 19 k/ 39.098 20 ca/ 40.007 skip 21 - 30 31 ga/ 69.723 32 ge 72.64 33 as/ 74.921 34 se/ 78.96 35 br/ 79.904 36 kr/ 83.8 metals metalloids nonmetals **galactic element clues**

Step-by-step answer

P Answered by Master

34

H=Gs, Li=Me, Na=So, K=Bn, Be=Am, Mg=A, Ca=Bo, B=Sc, Al=Lm, Ga=Sk, C=Or, Si=Co, Ge=Ik, N=At, P=Fw, As=Ki, O=Bt, S=Re, Se=Uv, F=T, Cl=Ms, Br=Lq, He=Fl, Ne=Lg, Ar=Nb, and Kr=Sp.

I may skipped one by mistake, let me know if this answers everything or if you need any other help with it.

Chemistry

1. Identify the set of oxides that consist of an acidic, basic, a neutral and an amphoteric oxide respectively a. SO3 , CaO, H2O, Al3O3 b. SO3, MgO, NO, Na2O c. N2O, K2O, H2O, ZnO d. CO2, CO, SO2, Al2O 2. Reactions of alkene are mostly a. Elimination reactions b. Subtraction reaction c. Substitution reaction d. Addition reaction 3. The thermal stability of alkaline earth metal nitrate is in the order Mg(NO3)2 is the correct reason for this observation? a. The higher the melting point of these nitrates b. The increase in the ionic radius of the

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P Answered by PhD

1) Answer: SO3 , CaO, H2O, Al3O3
Explanation: SO3 - acidic; CaO - basic; H2O - neutral; Al3O3 - amphoteric
2) Answer: d. Addition reaction
Explanation: Because they have a double connection.
3) Answer: b. The increase in the ionic radius of the element
Explanation: The thermal stability is determined by the standard lattice energy.
The larger the charges of the ions, the stronger the attraction between them, and the greater the energy of the lattice.
4) Answer: c. The isotopic nature of the element
Explanation: Because the other 3 options affect the ionization energy of the element.
5) Answer: a. The nuclear charge of the elements increases
Explanation: In a group of elements, the ionization energy decreases with an increase in the ordinal number of the element. This is due to the increase in the size of atoms and the shielding of external electrons by internal ones.
7) Answer: c. Basic oxides
Explanation: The basic oxides form metals with valence – I or II. (groups 1 and 2)
8) Answer: b. C4H8O
Explanation: If we divide the masses of substances into atomic masses, we get the ratio: 5,5:11:1,3 => 4:8:1 => C4H8O
9) Answer: c. d – block
Explanation: Transition metals are located in the secondary subgroups of the Periodic table of D. I. Mendeleev. They are divided into d-elements.
10) Answer: d. 4s2
3d104p
Explanation: Because all the layers of the s, d and p levels are filled.
11) Answer: d. 75.0cm3
Explanation: 15.0+60.0=75.0 cm3
12) Answer: d. K2SO4, K2SeO4, K2TeO4
Explanation: In this series, substances contain an equal number of electrons in the form of oxygen.
13) Answer: c. CH4(g) and NaH(s)
Explanation: CH4 - covalent; NaH - ionic
14) Answer: c. Substitution
Explanation: Benzene is characterized by substitution reactions — benzene reacts with alkenes, chloralkanes, halogens, nitric and sulfuric acids.
15) Answer: b. Propene
Explanation: Unsaturated hydrocarbons of alkenes and alkynes belong to the group of aliphatic compounds.
16) Answer: b. ns2
np5
Explanation: The general electronic configuration of the external energy level is nS2nP5.
17) Answer: d. Incomplete (n-1)d subshell
Explanation: The color in transition series metal compounds is usually due to two main types of electronic transitions: charge-transfer transitions and dd transitions. The reason why transition metals in particular are bright is because they have unfilled or half-filled d-orbitals.
18) Answer: b. They have one or more unpaired electron
Explanation: Paramagnetic are atoms and ions with
incomplete electron shells, i.e.
all transition d - and f-elements.
19) Answer: a. 2, 4 – dimethylpentan – 2 – ol
Explanation: Because there are 2 methyl groups, in the long chain - pentane.
20) Answer: b. Acetylene flame
Explanation: Acetylene has become the most widespread since it has the highest temperature compared to the flame of other gases.

Chemistry

(i have a chemistry study guide that confuses me, anything will ! ) 1) the variable observed during an experiment is called 2) pure chemistry is defined as 3) if the given mass of silver is 45.6g , and the density of silver is 10.5g/ml, calculate the volume 4) an example of physical properties of a substance is 5) difference between a mixture and a compound is 6) particles found in nucleus are 7) the sum of the protons and neutrons in an atom equals the 8) the maximum number of d orbitals in a principal energy level are 9) elements that are characterized

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Variable observed in experiment is independent variable for question 1!

History

(i have a chemistry study guide that confuses me, anything will ! ) 1) the variable observed during an experiment is called 2) pure chemistry is defined as 3) if the given mass of silver is 45.6g , and the density of silver is 10.5g/ml, calculate the volume 4) an example of physical properties of a substance is 5) difference between a mixture and a compound is 6) particles found in nucleus are 7) the sum of the protons and neutrons in an atom equals the 8) the maximum number of d orbitals in a principal energy level are 9) elements that are characterized

Step-by-step answer

P Answered by Master

11

Hi