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22 Cards in this Set

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Define atom.
The smallest unit of an element that has all the properties of that element.
What is the atomic theory?
A theory that all matter is matter is made up of tiny particles called atoms.
How do atoms differ from one another?
Each has a different number of protons in its nucleus.
Which subatomic particle has no charge at all?
neutron
If an atom has more protons than electrons, then what is the atom's charge?
positive
Scientists know that atoms are made up of even smaller particles called__________.
subatomic particles
Where is almost all of an atom's mass?
In it's nucleus
What is the very tiny center of an atom?
nucleus
How many atoms must be linked together to form a molecule?
2 or more
Which subatomic particle has a positive charge?
proton
If an atom has more electrons than protons, then what is the atom's charge?
negative
What is the nucleus made up of?
protons & neutrons
Why is gold considered an element?
Because it is made up of only one kind of atom.
The paths in which the electrons move are called_____.
orbits
Where low-energy electrons orbit?
Close to the nucleus.
Which subatomic particle has a negative charge?
electron
What is an atom called that has the same number of protons and electrons?

Why?
neutral

Because a positive and negative charge cancel each other out.
Where do high-energy electrons orbit?
Farther away from the nucleus.
What are the five properties of metals?
1) have luster
2) are malleable
3) are ductile
4) conducts electricity
5) conducts heat
Why are orbits also referred to as energy levels?
Because their distance from the nucleus depends on the energy of the electrons in them.
Define element.
A substance made up of only one kind of atom.
Which is NOT a part of an atom?

protons, neutrons, electrons, elements
elements