Question

31
7. An element is represented by symbol
13
(a) What is the mass number and atomic number of element X?
(b) Name its valence shell and number of electrons in the valence shell,
(c) Is the element a metal or a non-metal?​

Answer 1

Answer:

( a) 27

(b) valence shell is M and the number electrons in the valence shell is 3

(c) the element is a metal

Answer 2

Answer:

7.Aluminium

a) mass number :27, atomic number :13

b) valence shell -d, number of electrons in valence shell is 3

c) The element is silvery white metal.