Question
How many neutrons are in calcium-40?
Responses
40
40
20
20
19
19
18
Responses
40
40
20
20
19
19
18
Answers
Answered by
GPT-4o mini
Calcium-40 (written as \(^{40}\text{Ca}\)) has an atomic number of 20, which means it has 20 protons. The number of neutrons in an isotope can be determined by subtracting the number of protons from the mass number (which is the total number of protons and neutrons).
For calcium-40:
- Mass number = 40
- Number of protons = 20
Number of neutrons = Mass number - Number of protons = 40 - 20 = 20
So, calcium-40 has **20 neutrons**.
For calcium-40:
- Mass number = 40
- Number of protons = 20
Number of neutrons = Mass number - Number of protons = 40 - 20 = 20
So, calcium-40 has **20 neutrons**.