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Which of the following has the least mass?

What did Democritus, Dalton, Bohr, Thomson, & Rutherford have in common?

a beehive with bees buzzing around it could be used as a rough ____________ of the atom.

What's the difference between atomic number and mass number?

The number of protons in an atom determines its

How was Bohr's theory of atomic structure similar to the current one?

The atomic mass is an average of the masses of all naturally occurring isotopes of an element.

In Thomson's "plum-pudding" model of the atom, the plums represent

How are protons able to stay tightly packed in the nucleus of an atom when protons strongly repel each other?

An atom of gold with 79 protons, 79 electrons, and 118 neutrons  would have an atomic mass of:

Electrons are found in the nucleus of an atom

A positively charged particle with a mass of 1 amu.

Electrons have no charge.

The atomic number of an element is the number of protons and neutrons in the nucleus.

What is the weighted average of all the naturally occuring isotopes of an element?

How was Bohr's theory of atomic structure different to the current one?

The region in an atom that contains most of the mass is

Different _________ of an element have different numbers of neutrons.

all atoms of the same element contain the same number of protons.