The Structure Of The Atom

An atom is the __________ particle of an element that has the same properties as that element.

smallest

Protons are positively charged particles with a charge of __________.

+1

__________ have no charge.

Neutrons

Electrons are negatively charged particles with a charge of __________.

-1

Protons and neutrons are found in the __________ of an atom.

nucleus

Electrons __________ around the atom.

orbit

In an electrically neutral atom, the number of protons equals the number of __________.

electrons

Different elements have different __________ counts and arrangements.

particle

The unit used to express the mass of an atom is called __________.

Atomic Mass Unit (AMU)

Both protons and neutrons have a mass of __________ AMU.

1

Electrons have a mass of __________ AMU.

0.0006

__________ are small particles that make protons and neutrons.

Quarks

The __________ number (Z) is the number of protons in an atom.

Atomic

The __________ number differs for each element and is written above the periodic table.

atomic

You cannot use the number of __________ to identify an atom.

electrons

Every atom of a given element has the same __________ number.

atomic

When an atom loses electrons, it becomes __________ charged.

positively

When an atom gains electrons, it becomes __________ charged.

negatively

The __________ number (A) is the number of protons and neutrons in the nucleus of an atom.

mass

Atoms of the same element can have different __________ numbers.

mass

The formula for finding the number of neutrons is __________.

N = (A-Z)

Isotopes are atoms of the same element with different __________ numbers.

mass

The mass of a single atom is approximately equal to the total mass of the __________ and __________ in an atom.

protons; neutrons

The mass of an electron is __________.

insignificant

The __________ atomic mass is the weighted average mass of all isotopes of an element.

average