Question

Element X and Y have atomic numbers 11 and 17 respectively. Which one of the elements is a metal? Give the reason for your answer.

Answer 1

element x is a metal

Explanation:

sodium has atomic number 11and chlorine has atomic number 17,so

Answer 2

element X is sodium (Na)

element Y is chlorine(Cl)

X is metal because it forms basic oxide I.e. NaOH

as we know that metal will always form basic oxide