JAMB - Chemistry (2009 - No. 7)
If an atom is represented as \( _{11}^{23}X \), which of the following deduction is correct?
it contains 12 protons
it forms a covalent chloride
its atomic number is 23
it is an alkali metal
คำอธิบาย
Sodium has atomic / proton number of 11 and belongs to Group 1[alkali metals] on the periodic table