Question

where would you expect the element with atomic number 12 in the modern periodic table and why?​

Answer 1

Answer:

Element: Magnesium

Group 2

Period 3

Explanation:

you need to find electronic configuration of the element first . from that you know in which block does the element lie.

For eg . Magnesium is a [Ne]3s2. So it is in group 1 or 2.

next by valency you know the exact group. There is no way of telling the period though.

Physical properties

Atomic mass: 24.305

Density: 1.74 g/cm3

Group: Alkali-earth metals

Electrons: [Ne] 3s2

Melting point: 922 K

Boiling point: 1380 K

Discovered: 1755