Question

From the table given below answer the following questions
Element A B C D E
Mass number 11 19 4 23 9
Atomic number 5 9 2 11 4
A) how many electrons are present in E
B) which among the above is an inert gad and why
C) which will form negatively charged ion
D) which element has 12 neutrons and why
E) which atom will form cation with one positive charge

Answer 1

A) 4

B ) Element C is an inert gas because it is stable as it has completely filled outer shell.

C) Element B will form negativity charged ion.

D) Element D has 12 neutron so that there would be balance between 11 proton and 12 neutron.

E) Element D will form cation.

HOPE IT HELPS DEAR!!!

Answer 2

A) 4

As, atomic number is 4

B) C

Because, it has stable electronic configuration ( duplet of valence electrons)

C) B

Because it has 7 valence electrons. Thus, it needs 1 more electron to complete its octet

D) D

Because number of neutrons= mass number - atomic number=23-11=12

E) D

Because it has only one valence electron. Thus to achieve octet it must donate this 1 electron forming singly positively charged ion.