Atom Basics
What is the smallest unit of an element?
Atom
What charge does a proton have?
Positive. +
What charge does a neutron have?
No charge. 0
What charge does an electron have?
Negative. -
What is a layer around the nucleus where electrons are found?
Energy level.
What is found in the center of an atom?
Nucleus
Where are protons located?
In the nucleus.
Where are neutrons located?
In the nucleus.
Where are electrons located?
Outside of the nucleus.
What describes how electrons are arranged in an atom?
Electron configuration.
Name the main subatomic particles.
Protons, neutrons, electrons.
Which particle determines the identity of an element?
Proton.
Two atoms of the same element can have different numbers of what particles?
Neutrons.
Which particle moves around the nucleus?
Electron.
Which energy levels are closer to the nucleus: lower or higher levels?
Lower energy levels.
Which particles are located inside the nucleus?
Protons and neutrons.
An atom has 8 protons. What is the atomic number?
8
Mass number = 12 and protons = 6. How many neutrons are there?
6
A neutral atom has 8 protons. How many electrons?
8
What do we call the energy level farthest from the nucleus that contains electrons?
Outermost energy level.
What makes one element different from another?
Number of protons.
If an atom has 17 protons, can it be oxygen? Explain.
No. Oxygen has 8 protons.
What is an isotope?
Atoms of the same element with different numbers of neutrons.
Are all electrons the same distance from the nucleus?
No.
What are the electrons in the outermost energy level called?
Valence electrons.