16. Give the number of core electrons for S. A) 14 B) 16 C) 12 D) 8 E) 10 17. Ho
ID: 1043889 • Letter: 1
Question
16. Give the number of core electrons for S.
A) 14 B) 16 C) 12 D) 8 E) 10
17. How many unpaired electrons are present in the ground state N atom?
A) 3 B) 4 C) 1 D) 2 E) 0
18. How many unpaired electrons are present in the ground state Si atom?
A) 2 B) 8 C) 3 D) 4 E) 5
21. ) Identify the transition element.
A) K
B)S
C) Fm
D) W
E) None of the above
23. Which atom in each group (I and II) has the smallest atomic radius?
(I) Ca, Ti, Br (II) O, S, Se
A) Br; O
B) Ca; Se
C) Br; Se
D) Ca; O
26. Of the following, which element has the highest first ionization energy?
A) boron B) beryllium C) lithium D) hydrogen
27. Identify the states of the halogens at room temperature.
A) Fluorine, chlorine, bromine, and iodine are gases .
B) Fluorine and chlorine are gases, bromine is a liquid, and iodine is a solid.
C) Fluorine and iodine are gases , chlorine and bromine are gases .
D) Fluorine is a gas, chlorine and bromine are liquids, and iodine is a solid.
E) Fluorine, chlorine, and bromine are gases , and iodine is a solid.
Explanation / Answer
16) E.10
S : 1s^2 2s^2 2p^6 3s^2 3p^4
So, core electrons = 10
17) A.3
N : 1s^2 2s^2 2p^3
18) A.2
Si : 1s^2 2s^2 2p^6 3s^2 3p^2
21 ) D.W
K(potassium) is alkaline metal
S(sulfur) belongs to chalcogens
Fm is a f-block element
W(tungsten) belongs to transition elements
23) A . Br;O
From left to right in a period atomic radius decreases
From top to bottom in a group atomic radius increases
26) D.hydrogen
With increase in atomic size ionization energy decreases.
27) B) Fluorine and chlorine are gases, bromine is a liquid, and iodine is a solid.
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