Question

Please answer these questions. It's urgent​

Answer 1

Explanation:

1

a)radioactive element

these elements are made up of atoms whose nuclei are unstable and given off atomic radiation as part of a process of attaining stability

b)valency

it is the combining capacity of atoms

or

number of electrons present in the last shell

c)atomic number

it is the number of electrons or protons present in an atom

2

Al

2 , 8 , 3

N

2 , 5

Cl

2 , 8 , 7

3

a)metals are having 1 or 2 or 3 electrons in their last shell where as non metals are having 4 or 5 or 6 or 7 electrons in their last shell metals are shiny and non metals are not etc

b)positive charged ion is called as cation where as negative charged ion is called as anion