phys sci ('23-'24) semester test

Which of the following determines the identity of an atom?

• Protons
• Neutrons
• Electrons
• Positrons

Ions

• positively or negatively charged atoms
• the energy released when one mole of an ionic crystalline compound is formed from gaseous ions
• Rule that states that atoms will form bonds in order to have 8 valence electrons
• Higher melting and boiling points

cation

• A positively charged ion
• Occurs between a metal and a nonmetal.
• A material's ability to allow heat or electric charges to flow.
• Formed when one or more electrons are transferred from one atom to another

anion

• A negatively charged ion
• Share two pairs of electrons
• the rules used in naming substances
• When the bonding electrons are shared unequally by the bonded atoms.

This person created the planetary model of the atom.

• Niels Bohr
• J. J. Thomson
• Ernest Rutherford
• Democritus

This person created the nuclear model of the atom.

• Ernest Rutherford
• J. J. Thomson
• Niels Bohr
• John Dalton

Who first said that the nucleus of the atom is a small and positiviely charged?

• Ernest Rutherford
• John Dalton
• J. J. Thomson
• Erwin Schrodinger

What number should be at the bottom left of this symbol?

• 17
• 35
• 18
• 20

How many electrons are in the ion?

• 40 e-
• 22 e-
• 18 e-
• 20 e-

How many protons are in the element?

• 20
• 40
• 60
• 2