Question

1. the element with atomic number 11 is:

a) sodium (na)
b) magnesium (mg)
c) potassium (k)
d) neon (ne)

Explanation:

The atomic number of an element is the number of protons in its nucleus. Sodium (Na) has an atomic number of 11, Magnesium (Mg) has an atomic number of 12, Potassium (K) has an atomic number of 19, and Neon (Ne) has an atomic number of 10.

Answer:

A. Sodium (Na)