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Atomic numbers are determined by the number of protons an atom has. The mass number is determined by the number of protons and neutrons. While the number of protons can't change (as the element itself would change), neutrons can and do vary. These are called isotopes.

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A sample of calcium contains calcium -40 calcium -44 calcium -42 calcium -48 calcium -43 and calcium -46 atoms Explain why these atoms can have different mass numbers bu the must have the same atomic?

The number of protons in an atom determines its atomic number, which is the same for all calcium atoms (20). The mass number of an atom is the sum of its protons and neutrons. The different mass numbers for these calcium atoms are due to variations in the number of neutrons, resulting in isotopes of calcium.


What is atomic number for calcium?

The atomic number of calcium is 20.


What is the atomic number for calcium?

The most common calcium isotope, calcium-40, has 20 neutrons.


What is the range of atomic number of calcium?

The atomic number of calcium is 20.


What is atomic no of calcium?

The atomic number of Calcium is 20.


Calcium's atomic number?

Calcium is a metal element. atomic number of it is 20.


How many neutrons calcium?

The number of neutrons is the difference between the Atomic Mass of an isotope and the atomic number of the element; each isotope of calcium has a different number of neutrons. See the link below for calcium isotopes.


Why atomic number of different elements are different?

Because different elements have different numbers of protons, which determines the atomic number.


What is atomic number of calcium?

Calcium is a meta element. Atomic number of it is 20.


What is the atomic number of calcium and what does that number tell you about an atom of calcium?

The atomic number of calcium is 20. The atomic number tells you the number of protons in the nucleus of a calcium atom, which also corresponds to the number of electrons in a neutral calcium atom.


What are atoms that have the same atomic number but different neutron numbers?

Atoms that have the same atomic number but different neutron numbers are known as isotopes. Isotopes of an element have the same number of protons but different numbers of neutrons, leading to variations in their atomic mass.


Do isotopes of an element have the same atomic mass but different atomic number?

The different mass numbers are due to different numbers of neutrons.