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16 questions
What is the smallest unit of matter? It is composed of protons and neutrons, held together in the nucleus, and electrons around the nucleus in different electron orbitals, which form an electron cloud.
cell
nucleus
atom
electron
What are any of the various self-contained units of matter or energy that are fundamental parts of all matter. These particles include electrons, protons, and neutrons.
subatomic particles
elements
nucleus
electron cloud
What is a subatomic particle with a positive charge that is in the nucleus of an atom?
neutron
proton
electron
valence electron
What is a subatomic particle without an electric charge, located in the nucleus of an atom?
neutron
proton
electron
valence electron
What is a subatomic particle with a negative charge? It is found in the electron cloud surrounding the nucleus.
neutron
proton
electron
electron cloud
What is the center of an atom containing protons and neutrons?
nucleus
neutron
proton
electron cloud
What mass does a neutron have?
1 amu
0 amu
-1 amu
+2 amu
How many electrons does this atom have?
2
4
6
10
The smallest piece of an element:
quark
electron
shell
atom
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