4. Atoms and Elements

In simplified atomic structure, what is the approximate mass of a neutron in atomic mass units (amu)?

In a neutral atom, which subatomic particle carries a negative charge?

What is the approximate mass of a proton?

In a simplified model of the atom, which subatomic particle has a positive charge?

Which element has 23 protons in its nucleus (i.e., atomic number $23$)?

In simplified atomic models, what is the approximate mass of one neutron?

How many protons and electrons are there in a neutral atom of each of the following elements? a. argon

In introductory chemistry, what is the approximate mass of a neutron?

Which element is neutral if it has 56 electrons?

How many protons does a neutral sodium atom have?

How many protons are there in a neutral chlorine atom ($Cl$)?

How many protons are in an atom of bromine (Br)?

Which element has 76 protons in its nucleus?

In the simplified subatomic particle model, which quantity predicts the element to which an atom belongs?

How many protons are in a neutral atom of copper (Cu)?