______ are atoms of the same element that have different numbers of neutrons.

An atom containing six positive charges and six negative charges has ______ charge.

Protons have ______ charge.

Electrons have ______ charge.

Neutrons have ______ charge.

The number of neutrons in the nucleus of an atom is equal to the mass number minus the atomic number. According to this definition and the table, how many neutrons are in the nucleus of a strontium atom?

Which element is represented by this Bohr model?

According to the table, which element has the LOWEST atomic number?

According to the table, which alkaline Earth metal has a mass number greater than 100?

According to this information, which solid has an atomic mass greater than 200?

The table lists properties of some elements. Which element would you expect to be in group 18 of the periodic table?

The illustration shows the upper right section of the periodic table. What element is represented by the single box at the top?

Carbon-14 and carbon-12 have the same number of protons but a different number of neutrons. These different forms of the same element are called

This chart gives the results of an experiment testing physical and chemical properties of elements. A fifth element also was tested. It did not conduct electricity, it reacted with alkali metals, and it was a gas. This element behaves most similarly to

Which of the following is not a subatomic particle?

According to this chemical formula, all of the following elements are found in phosphoric acid EXCEPT ______.

Alkali metals belong to a group of elements whose atoms have only one electron in their outer energy level. According to this definition, which of these is an atom of an alkali metal?

The atoms in Group A are different from the atoms in Group B because only the atoms in Group A have ____________.

Which particle is located in the cloud region of the atom?

The substances that undergo change in a chemical reaction are called

How many particles are in one mole of a substance?

Which of these is a product?

A coefficient in the formula is _________.

Which of the following is the reason why atoms of sodium and chlorine attract each other in a salt crystal?

The diagram shows the oxidation numbers of certain groups in the periodic table. According to the diagram, which group is LEAST likely to combine with other elements to form compounds?

Which process is taking place in these chemical combinations?

Which element, represented by X, would have the valence electron configuration shown in the diagram?

Calcium fluoride (CaF2) is an ionic solid that is a natural source of fluorine for the chemical industry. What is the charge on the calcium ion in calcium fluoride?

Which of the following does NOT state what the arrow means in a chemical equation?

Which of these is not a type of nuclear radiation?

In a radioactive nucleus, the electric force _____ the strong force.

Protons do not repel each other in the nucleus because of the ______.

Which are found in the nucleus of an atom?

Gamma rays _________.

What type of nuclear decay is represented in this illustration?

The mass number of a nucleus is equal to ______.

Carbon-14 and carbon-12 have the same number of protons but a different number of neutrons. These different forms of the same element are called

Which of these is an alpha particle?

Which force holds protons and neutrons together in the atom nucleus?

Which force holds protons and neutrons together in the atom nucleus?

Which best represents nuclear fission?

Which of these diagrams represents the type of nuclear reaction that produces energy in the Sun?

A high temperature is required for which to occur?

During nuclear fission, a nucleus _________.

Only nuclei with _________ atomic numbers can undergo fission.

What is the term for an ongoing series of nuclear reactions?

When two smaller nuclei come together, it is called ________.

What type of nuclear reaction is shown?

What type of relationship did Einstein state there was between energy and mass?