What can vary without changing the identity of an element?

What can vary without changing the identity of an element?

ANSWER: (b) mass number can vary without changing the identity of the element.

What is the difference between nucleon number and proton number?

The proton number (Z) of an atom is the number of protons it contains. All oxygen atoms have 8 protons and all sodium atoms have 11 protons. The nucleon number (or mass number) of an atom is the total number of protons and neutrons it contains.

Does changing the number of protons change the identity of the element?

Explanation: The identity of an element is determined by the number of protons. One cannot alter the number of protons without altering the identity of the element. By adding a proton, the atomic number increases by one and the element identity changes.

Can the mass number vary without changing the identity of an atom?

the number of protons and neutrons in an atom. the number of protons in an atom. The mass number is O the number of protons and neutrons in an atom. Neither the mass number nor the atomic number can vary without changing the identity of an atom.

Why do protons never change?

Explanation: An elements atomic number will never change, that is because the atomic number is its “identity.” The atomic number is the number of protons that is contained in the nucleus, if you add a proton you change the element. Therefore, an elements atomic number will never change.

Why is the proton number of an element usually different from the nucleon number of an atom of the element?

Because electrons have virtually no mass, just about all the mass of an atom is in its protons and neutrons. Therefore, the total number of protons and neutrons in an atom determines its mass in atomic mass units (Table 4.5.

What is the difference between proton and proton number?

The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. It is identical to the charge number of the nucleus. In an uncharged atom, the atomic number is also equal to the number of electrons.

Is proton number equal to electron number?

The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).

Do protons change elements?

Adding or removing protons from the nucleus changes the charge of the nucleus and changes that atom’s atomic number. So, adding or removing protons from the nucleus changes what element that atom is! For example, adding a proton to the nucleus of an atom of hydrogen creates an atom of helium.

What happens when the number of protons change?

When you change the number of protons in an atom, you will change the atom from one element to a different element. Sometimes, when you add a proton to an element, the element will become radioactive. If you change the number of electrons in an atom, you will get an ion of the element.

Does adding a proton change the mass?

It does, however, change the mass of the nucleus. For example, adding a proton to the nucleus of an atom of hydrogen creates an atom of helium. (Actually, a few neutrons have to be added as well to make the new nucleus stable, but the end result is still helium.)

What is the difference between proton number and nucleon number?

The proton (or atomic) number is the number of protons present in the nucleus of the atom. The atom is electrically neutral. Hence, the atom has the same number of protons as its number of electrons. The nucleon (or mass) number is the number of nucleons (sum of protons and neutrons) present in the nucleus…

How does the number of protons and electrons relate to mass?

Hence, the atom has the same number of protons as its number of electrons. The nucleon (or mass) number is the number of nucleons (sum of protons and neutrons) present in the nucleus of the atom.

How do you find the number of neutrons in an atom?

The number of neutrons present in the nucleus of the atom (the neutron number, N) may be deduced by subtracting the proton number (Z) from its nucleon number (A). Nucleon number (A) = neutron number (N) + proton number (Z) Administrator of Mini Physics.

What is the nucleon number of helium in the nucleus?

The nucleon number is the number of nucleons. The nucleon number for helium is four, because helium has two protons and two neutrons in its nucleus. Most elements exist in a variety of forms, having different numbers of neutrons (but the same number of protons, since the proton number is what defines an element).