Question

() The following is a list of the electronic distributions of atoms of unknown elements.
Element
Electronic distribution
A.
2,5
B
2, 8,4
с
2, 8, 8, 2
D
2, 8, 18,8
E
2,8, 18,8,1
F
2, 8, 18, 18,7
Choose an element from the list for each of the following descriptions.
(a) It is a noble gas.
(6) It is a soft metal with a low density.
(c) It has a giant covalent structure similar to diamond.
(d) It can form a negative ion of the type X%.
() How does electronic configurations of atoms change in a period with increase in atomi
number?​

Answer 1

Explanation:

In a period, the inner core shell remains same and the valence electrons in valence shell goes on increasing from left to right. The number of shells is same.