Part A - Answer all questions in this part.

Which postulate is part of Dalton's Atomic Theory?

• Atoms are indivisible and indestructible.

• Atoms can be created during chemical reactions.

• Atoms of different elements cannot combine.

• Atoms can change their mass in chemical reactions.

J.J. Thompson's cathode ray tube experiment demonstrated that:

• atoms are indivisible.

• electrons are found in the nucleus.

• protons have a positive charge.

• electrons have a negative charge.

Mendeleev's periodic table was arranged by:

• atomic number.

• atomic mass.

• number of neutrons.

• electron configuration.

The periodic law states that:

• elements are arranged by increasing atomic number.

• isotopes have the same atomic mass.

• all elements are metals.

• atomic radius increases across a period.

Which of the following is a compound?

• oxygen

• saltwater

• carbon dioxide

• helium

An ionic bond is formed when:

• two nonmetals share electrons.

• two metals share electrons.

• a nonmetal gains electrons from another nonmetal.

• a metal transfers electrons to a nonmetal.

Rutherford's gold foil experiment showed that:

• atoms are mostly empty space.

• electrons are located in circular orbits.

• the nucleus is positively charged.

• atoms cannot be divided.

Which subatomic particle has no charge?

• proton

• nucleus

• electron

• neutron

Which property increases as you move down Group 1 in the Periodic Table?

• ionization energy

• electronegativity

• atomic radius

• melting point

Elements in the same group have similar:

• atomic masses.

• numbers of valence electrons.

• densities.

• atomic radii.