Unit 1 practice

Front

What is the relationship between the number of protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons is equal to the number of electrons.

Front

What charge does an atom have when it gains electrons?

Back

When an atom gains electrons, it has a negative charge.

Front

What does the atomic number represent?

Back

The atomic number is equal to the number of protons in an atom.

Front

If an atom loses electrons, what happens to its charge?

Back

If an atom loses electrons, it becomes positively charged.

Front

How many electrons does a magnesium ion have if it loses 2 electrons?

Back

A magnesium ion that loses 2 electrons has 10 electrons.

Front

What is the charge of an oxygen atom with 8 protons and 10 electrons?

Back

An oxygen atom with 8 protons and 10 electrons has a -2 charge.

Front

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

Back

The number of neutrons can be calculated by subtracting the atomic number from the atomic mass.

Front

What is the atomic mass of an element?

Back

The atomic mass is the weighted average mass of an element's isotopes.

Front

What is an ion?

Back

An ion is an atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Front

What is the significance of the atomic number in the periodic table?

Back

The atomic number determines the position of an element in the periodic table and its chemical properties.