Question

using the table, what is the mass number for boron? * (0.5 points)

Explanation:

Step1: Recall mass - number formula

The mass number ($A$) is the sum of protons and neutrons in an atom, $A =$ number of protons+number of neutrons.

Step2: Find number of protons and neutrons for boron

From the table, for boron, the number of protons is not given directly but we know boron has an atomic number of 5 (a known fact from the periodic - table). The number of neutrons for boron in the table is 5.

Step3: Calculate mass number

$A=5 + 5=10$

Answer:

10