Which element on the periodic table contains 5 protons? a. copper b. boron c. sodium d. aluminum

B

Explanation:

Periodic table is a table of the chemical elements arranged in order of atomic number, usually in rows called periods, so that elements with similar atomic structure (similar chemical properties) appear in vertical columns.

The proton number or atomic number (symbol- Z) is the number of protons found in the nucleus of every atom of that element. The proton number is also equal to the number of electrons in orbit around a neutral atom. This is the case of Boron (B), which has 5 electrons and 5 protons.

Boron is located in period 2, group 13 of the periodic table. It has an atomic number equal to 5, meaning any atom with 5 protons in its nucleus is a Boron atom. It has an atomic mass of 11. It also possesses 5 protons and 5 electrons making it a neutral atom ( i.e. no charge).