Question

nformation provided, fill in the blanks for
18
ar
argon
39.95
protons: 18
neutrons:
electrons:
atomic number:
atomic mass:
35

Explanation:

Step1: Recall atomic number property

The atomic number is equal to the number of protons. Given the atomic number of argon is 18, so the number of protons is 18.

Step2: Calculate number of neutrons

The atomic mass is approximately the sum of protons and neutrons. Atomic mass of argon is 39.95, rounding to 40. Neutrons = Atomic mass - Protons. So neutrons = 40 - 18 = 22.

Step3: Determine number of electrons

In a neutral atom, the number of electrons is equal to the number of protons. So electrons = 18.

Step4: Identify atomic number

Atomic number is given as 18 in the element - box.

Step5: Identify atomic mass

Atomic mass is given as 39.95 in the element - box.

Answer:

Neutrons: 22
Electrons: 18
Atomic Number: 18
Atomic Mass: 39.95