What is the number of protons plus the number of neutrons in the nucleus of an atom equivalent to?

atomic number

atomic charge

mass number

atomic weight

2. What is the most complete list of the particle (s) that are located within the nucleus of an atom?

electrons

neutrons

protons

protons and neutrons

3. An atom has a charge of - 3 in its orbitals.

Which statement must be true in order for this atom to have no net charge?

There are three neutral neutrons in the nucleus.

There are three positively charged protons in the nucleus.

There are two positively charged protons in the nucleus and one in an orbital.

There are three positively charged protons outside the nucleus.

1. mass number

2. protons and neutrons

For 1: The correct answer is mass number.

For 2: The correct answer is protons and neutrons

For 3: The correct answer is there are three positively charged protons in the nucleus.

Explanation:

For 1:

Atomic number is defined as the number of protons or electrons that are present in a neutral atom.

Atomic number = number of protons = number of electrons

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.

Mass number = Number of protons + Number of neutrons

Atomic weight is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Atomic charge is defined as the number which arises when an atom looses or gains electrons

Hence, the correct answer is mass number.

For 2:

There are 3 subatomic particles present in an atom. They are: protons, electrons and neutrons.

Protons: They carry positive charger and are found in nucleus. Electrons: They carry negative charge and are found around the nucleus. Neutrons: They do not carry any charge and are found in nucleus.

Hence, the correct answer is protons and neutrons

For 3:

A neutral atom contains equal number of protons and electrons.

We are given:

An atom carries a charge of - 3. This means that 3 electrons are present in the atom

So, to neutralize it, we need 3 protons in the nucleus of an atom.

Hence, the correct answer is there are three positively charged protons in the nucleus.