Question

write the composition of one atom of the $^{42}ca$ isotope.
14 × protons
28 × neutrons
14 × electrons
recheck next (3 of 3) show approach
1st attempt

Explanation:

Step1: Identify atomic number of Ca

Calcium (Ca) has atomic number 20. So number of protons = 20.

Step2: Calculate number of neutrons

Mass - number of isotope is 42. Neutrons = Mass - number - Protons. So neutrons = 42 - 20=22.

Step3: Determine number of electrons

In a neutral atom, number of electrons = number of protons. So electrons = 20.

Answer:

20 protons, 22 neutrons, 20 electrons