1) Atoms with which of the following electron configurations are readily able to
ID: 911277 • Letter: 1
Question
1) Atoms with which of the following electron configurations are readily able to form cations?
I. ns2np3
II. ns2
III. ns2np5
a) III only
b) I and II
c) II and III
d) I and III
e) II only
2) The atomic radius of Br is ____ the atomic radius of Se because ______
a) larger than; the effective nuclear charge for the valence electrons of Br is greater.
b) smaller than; the effective nuclear charge for the valence electrons of Br is greater.
c) larger than; the effective nuclear charge for the valence electrons of Se is greater.
d) smaller than; the effective nuclear charge for the valence electrons of Se is greater.
e) the same size as; the effective nuclear charges for the valence electrons of Be and Se are identical
Explanation / Answer
1) answer is e II ONLY
BECAUSE THEY ARE ALKALINE EARTH METAL. METALS ARE ALWAYS READY TO LOSE THE ELCTRONS..BY LOSS OF ELECTRONS +VE CHARGE IS DEVELOED ON THE MEATLS THEY ARE CALLED AS CATIONS
2) b) smaller than; the effective nuclear charge for the valence electrons of Br is greater.
BECAUSE AS WE MOVE FROM LEFT RIGHT IN PERIODIC TABLE FIRST WE GET SELINIUN AND THEN WE GET BROMINE.AS WE MOVE FROM LEFT TO RIGHT,THE ATOMIC SIZE DECREASES.BECAUSE THE EFFCTIVE NUCLEAR CHARGE INCREASES.CONSEQUENTLY THE ELECTRONS PRESENT IN THE VALENCE SHELL OF BROMINE ARE STRONGLY ATTARACTED TOWARDS THE NUCLEUS AS COMPARED TO THE SELINIUM.HENCE THE DISTANCE BETWEEN THE VALENCE SHELL AND NUCLEUS IS VERY MUCH LESSIN BROMINE AS COMPARED TO THE SELINIUM.THERFORE
b) smaller than; the effective nuclear charge for the valence electrons of Br is greater.
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