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question 2
how many protons does $^{40}$ca contain?
periodictable.pdf
o a. 40
o b. 22
o c. 18
o d. 20

Explanation:

Step1: Identify atomic number of Ca

Calcium (Ca) has an atomic number of 20 (from periodic table).

Step2: Relate atomic number to protons

Atomic number = number of protons, so protons = 20.

Answer:

d. 20