Periodic Table of the FI t0 S. The similarity in chemical behavior of elements i

Question

Periodic Table of the FI t0 S. The similarity in chemical behavior of elements in the same group of the periodic table is best explained by the fact that atoms of these elements have: a) the same number of neutrons in the nucleus b) the same number of protons in the nuc similar nuclear composition d) the same number of valence electrons e) none of these 2. A metal M forms two different chlorides, MCI2 and MCls. The metal could be a) Fe 10. An element has electronic configuration 1s'2s2p 3s'3p 4s. Which element is in the same group? a) potassium 11. A pure substance X is heated and changes into two new substances, Y and Z. From this information, we can deduce that b) Ba c) Al d) Na e) none of these b) nickel c) aluminum d) magnesiume) none of these a) X is a compound b) Y and Z are both elements c) Y and Z are both compounds e) none of these d) X is an element and Y and Z are both compounds 12. A 15.0 mL volume of a gas is at 25.0 C. What is the volume if the temperature is doubled at constant pressure a) 30.6 mL b) 46.3 mL c 16.3 mL d) 71.3 mL e) none of these 13. When an electron in an atom moves from the ground state to an excited state a) no change in energy takes place b) light is emitted energy is emitted e) none of these d) energy is absorbed 14. The correct combination of coefficients when the following reaction is balanced are: Fe2Os(s) + Co(g Fe(s) +CO (g) c) 1, 3, 2, 3; a) 1, 2, 1, 3; b) 2, 2, 3, 1; d) 1, 2, 4, 5; e) none of these 15. Which of the following is a trace' element (an element essential for healthy growth)? a) Cd b) Zn c) Si d) Al e) none of these 16. How many molecules of N2 gas are in a 3.50 g sample of the substance? a) 7.53 x 1022 b) 1.50 x 1023 c 3.50 x 1023 d) 5.53 x 1022 17. How many calcium atoms are in a 5.0 g sample of the metal? (a) 7.5 x 1022 (b) 7.5 x 1022 (c) 7.5 x 1024 (d) 7.5 x 1024 (e) none of these

Explanation / Answer

Answer 8:

D

the symmetry of valence electrons and this electronic similarity should give rise to similar chemistry.

Answer 9

Fe can have vacancy as 2 and 3 and can form fecl2 and fecl3

Answer 10

D

Magnesium is having similar configurations

1s2 2s2 2p6 3s2 3p6 4s2

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