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35 Cards in this Set

  • Front
  • Back

electron

negative charge

atom

basic unit of matter

energy levels

three-dimensional orbits

Niels Bohr

drew first picture of atom

electron cloud

electrons reside here

molecule

atoms bonded

1st energy level

inner energy level

John Dalton

developed atomic theory

number of energy levels

seven

proton

positive charge

The basic atom is neutral.

true

Density equals volume divided by mass.

true

Buoyancy is a general property of matter.

false

Most of the atomic mass is in the nucleus.

true

Valence electrons determine to what extent an atom can combine.

true

Electrons move in a single plane.

false

The 3rd energy level can hold 18 electrons.

true

The atomic mass of hydrogen is one.

true

The four natural elements are fire, air, earth, and water.

true

A molecule is made up of two or more elements.

true

How many electrons are in the 1st energy level of each atom?

two

How many electrons is each atom sharing?

two

How many protons are in each nucleus?

eight

How may electrons does each atom have in its second energy level?

eight

How many total electrons does each atom have?

10 because they share two each

The particle which is opposite in charge to the electron is the

proton

The state of matter in which the molecules are closest together is the ____________ phase.

solid

protons are found in the

nucleus.

A molecule of water is made up of

three atoms

The maximum number of energy levels in an atom is

seven

A molecule is formed when two or more atoms are

combined.

The particle that determines the mass of the atom, along with the proton, is

neutron

The force causing an object to float is called

buoyancy

Nearly all the mass of an atom is found in the

nucleus

The idea that all matter is made up of very tiny particles called atoms is the

atomic theory