Potassium-40 is an isotope of potassium. The number 40 represents the atomic mass number, which is the sum of protons and neutrons in the nucleus.

Step 1: Identify the atomic number of potassium. The atomic number of potassium is 19, which means there are 19 protons.

Step 2: Subtract the number of protons from the atomic mass number to find the number of neutrons.

So, 40 (atomic mass number) - 19 (number of protons) = 21.

Therefore, a potassium-40 atom has 21 neutrons.

Question

Potassium-40 is an isotope of potassium. The number 40 represents the atomic mass number, which is the sum of protons and neutrons in the nucleus.

Step 1: Identify the atomic number of potassium. The atomic number of potassium is 19, which means there are 19 protons.

Step 2: Subtract the number of protons from the atomic mass number to find the number of neutrons.

So, 40 (atomic mass number) - 19 (number of protons) = 21.

Therefore, a potassium-40 atom has 21 neutrons.

Knowee AI · Accepted Answer

Potassium-40 is an isotope of potassium. The number 40 represents the atomic mass number, which is the sum of protons and neutrons in the nucleus.

Step 1: Identify the atomic number of potassium. The atomic number of potassium is 19, which means there are 19 protons.

Step 2: Subtract the number of protons from the atomic mass number to find the number of neutrons.

So, 40 (atomic mass number) - 19 (number of protons) = 21.

Therefore, a potassium-40 atom has 21 neutrons.

Determine how many neutrons each potassium-40 atom has.19214041