ATOMIC and Subatomic Theory

Which of Dalton's 5 Postulates were later proven not to be true.

• Matter is composed of very small particles called atoms

• For any given element, all atoms are identical

• Different atoms combine in simple whole number ratios to form compounds

• In chemical reactions, atoms are separated, combined, or rearranged

Rutherford's Gold Foil Experiment was used to determine the existence of the _______________.

• nucleus

• proton

• neutron

• electron

Bohr's planetary model has the _____________ orbiting the nucleus

• protons

• neutrons

• electrons

• beta particles

The _____________ has a positive (+1) charge and a mass of 1 amu?

• nucleus

• electron

• neutron

• proton

The _____________ has a negative (-1) charge and a relative 0 amu mass?

• electron

• nucleus

• proton

• neutron

The _____________ has no charge and a mass of 1 amu?

• nucleus

• proton

• neutron

• electron

___________________________ are found in the nucleus of the atom.

• electrons and protons

• protons and neutrons

• electrons and neutrons

• electrons and beta particles

______________ of an atom's mass is found in the nucleus>

• 10%

• 50%

• >99%

• 75%

The number of protons and neutrons in a atom is referred to its ______________.

• Mass Number

• Atomic Mass

• Atomic Number

• Atomic Weight

All electrically neutral atoms of a specific element has the same number of ____________________.

• protons

• neutrons

• electrons

• protons and electrons