Atomic Structure

Front

Mass number of an element with 18 protons, 18 electrons, and 19 neutrons.

Back

37

Front

The atomic number of an element with 9 protons, 9 electrons, and 10 neutrons is:

Back

9

Front

If the number of electrons in an atom changes you make a(n) __________________.

Back

ion

Front

How many neutrons does uranium-239 have?

Back

147

Front

Which statement about subatomic particles is true? Options: Protons, neutrons, and electrons all have about the same mass., Unlike protons or neutrons, electrons have no mass., Neutrons have no charge and no mass., An electron has far less mass than either a proton or neutron.

Back

An electron has far less mass than either a proton or neutron.

Front

What is unique for any given element?

Back

the number of protons

Front

Which statement is true about oxygen-17 and oxygen-18?

Back

They are isotopes of oxygen.

Front

mass number of a single atom is

Back

the sum of the protons and neutrons in the atom.

Front

The dense center region of an atom

Back

nucleus

Front

An atom has 10 protons and a mass number of 18. It has __ neutrons.

Back

8