CHEMISTRY EXAMINATION

What marked the start of the modern era of chemistry?

• Dalton’s Atomic Theory 

• Law of Multiple Proportions

• Allotropes of Carbon

• Proust’s Law of Definite Proportions

According to Dalton, what is the ultimate, indivisible unit of matter?

• atoms

• electrons

• protons

• neutrons

Which is true about the electrons?

• Electrons contribute to the mass of the atom.

• Electrons determine the identity of an element.

• Electrons are found inside the nucleus of the atom.

• Electrons determine the chemical behavior of an atom.

Which subatomic particle has a neutral charge?

• protons

• electrons

• neucleons

• neutrons

What is the mass of electrons in comparison to the mass of protons?

• approximately equal

• protons are heavier than electrons

• electrons are heavier than protons

• electrons are twice heavier than protons

The vertical (up and down) columns in the Periodic Table are called

• groups

• towers

• periods

• atomic numbers

The Modern Periodic Table of Elements is arranged by

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Which group of the periodic table is composed of inert (not reactive)  gases?

• alkali metals
• alkaline earth metals
• halogens
• noble gases

The atoms along the staircase are called 

• metals
• nonmetals
• metalloids
• noble gases

Elements in the same column of the periodic table always have the same # of _______ as one another.

• Protons
• Neutrons
• Electrons
• Valence Electrons