Question

An element has electronic configuration 2, 8, 7.
(a) To which group and period of the long form of Periodic Table does it belong?
(b) What is atomic number of this element?
(c) Is it metallic or non-metallic and why?
(d) Identify the element.
(e) Name an element chemically similar to this element.

Answer 1

Answer:

group 17

period 3

at no. 17

Answer 2

Chlorine (Cl)

Explanation:

Given electronic configuration is 2, 8, 7.

(a) Chlorine belongs to Group 17 and Period 3.

(b) Atomic number is 17 = number of electrons present in it.

(c) Chlorine is non-metallic because it has 7 electrons in its valence shell. So it has the tendency to attract one electron to become stable.

(d) Chlorine (Cl) is the element.

(e) Fluorine (F) is chemically similar to this element because Fluorine and Chlorine are both elements of Group 17, halogens.