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What subatomic particles make up the nucleus of an atom?
Electron and Proton
Electron and Neutron
Proton and Neutron
The atomic theory states that matter is made up of what?
Earth and air
If an atom has more electrons than protons then it has a what?
What do you call an atom which has the same number of protons and electrons?
Democritus coined the term "atomos" which means?
Which of the following is TRUE about an atom?
All matter is made up of it.
It is the smallest particle of an element.
It is made up of protons, electrons, and neutrons.
All of the above.
Who discovered electron?
Who discovered neutron?
Which of the following models of an atom shows electrons orbiting the nucleus?
Plum Pudding Model
Quantum Mechanical Model
The discovery of isotopes contradicted what postulate of Dalton's theory?
All atoms of a given element are alike.
All matter are made up of atoms.
Atoms may break apart into separate atoms, but the atoms themselves are unchanged.
When atoms form molecules, they unite in small whole numbered ratios.