Elements Answers

A potassium atom (atomic number 19) loses an electron while forming a bond with another atom.

The chemical symbol for the element calcium is Ca. What would be the symbol representing calcium atoms that have lost two electrons?

What can be added to an atom to cause a nonvalence electron in the atom to temporarily become a valence electron?

All large radioactive atoms decay into smaller atoms by releasing alpha particles. Each alpha particle has 2 protons, 2 neutrons, and 0 electrons. The table below describes several neutral, low-mass atoms.

The simple model below is a neutral magnesium (Mg) atom with the element’s most common mass number.

Scientists are working with a liquid that is made of only one type of atom. Which statement correctly describes this liquid?

The model below shows a carbide ion.

One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?

Uranium is an element that is often used in nuclear power plants. Uranium atoms are very large, and the substance can be dangerous if it is not carefully contained.