Atomic Theory Review

John Dalton wrote postulates to make the idea of the atom useful. Which postulate below was proven wrong?

• All elements are made up of tiny indivisible particles called atoms.

• The atoms of one element are different from the atoms of another element.

• Atoms of different elements chemically combine to form chemical compounds.

• During chemical reactions, atoms are rearranged.

Tags

NGSS.MS-PS1-5

The number of protons is equal to the number of electrons for an atom. This means an atom is-

• electrically neutral

• electrically positive

• electrically negative

What are atoms with the same number of protons but different numbers of neutrons?

• electrons

• protons

• neutrons

• isotopes

These are used to identify the element:

• protons

• neutrons

• electrons

• ions

Tags

NGSS.MS-PS1-1

How do you find the mass number?

• Protons+Electrons

• Protons+Neutrons

• Protons+Neutrons+Electrons

• Calculate it using the percent abundance for each isotope

How does Carbon-12 and Carbon-14 differ?

• # of protons

• Mass #

• # of neutrons

• Mass # and # of neutrons

Which scientist used the gold foil experiment in his discovery?

• Bohr

• Thomson

• Rutherford

• Chadwick

The identifying characteristic of an element is its number of

• protons.

• neutrons.

• electrons.

• orbitals.

What model of the atom came about first.

• 
• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

The name Democritus gave us the smallest possible particle of matter is

• molecule

• atom

• electron

• proton