Question

which of the following elements having the given atomic number have their chemical properties resembling magnesium ?
A) 13
B) 19
C) 11
D) 4

Answer 1

hey mate
magnesium atomic no is 12
so 11 is sodium and 13 is aluminium
and 19 will.be potassium.
so considering them all aluminium and magnesium exhibit similar prop as they are metal
but sodium wont bcz its highly reactive
so ans will be 13
i hope u understood!!

Answer 2

The answer is option (d) because in the periodic table, elements that have similar properties are in the same groups. Beryllium (atomic number = 4) and magnesium (atomic number = 12) like in the same group (group 2).