Question

7) The number of protons in an atom of an element A is 19 then, the number of electron in its

ion A

+

is:



a. 18

b. 19

c. 20

d. 21



8) Which of the following pairs will give displacement reactions?

a. NaCl solution and copper metal

b. MgCl2 solution and aluminium metal

c. FeSO4 solution and silver metal

d. AgNO3 solution and copper metal​

Answer 1

Explanation:

the number of electrons is 19

Answer 2

7. Answer is 18
8. Answer is idk