Elements & the Periodic Table Ch 3

This is made of an even smaller particles called protons, neutrons, and electrons.

• Atom

• Molecule

• Compound

• Diatomic Molecule

The very small center core of an atom.

• Electron

• Nucleus

• Electron Cloud

• Element

Which of the following is not true about the charges for the particles that make up an atom.

• Protons are positive.

• Neutrons are negative.

• Electrons are negative.

• Neutrons are neutral.

An atom with the same number of protons and a different number of neutrons from other atoms of the same element.

• Isotope

• Compound

• Diatomic Molecule

• Ion

Models are useful in which situation.

• Objects are too small or too big.

• Objects are too fast or too slow.

• Objects are too dangerous

• Objects are too far away to see.

• All of the above.

Who created the first periodic table?

• Niels Bohr

• Dmitri Mendeleev

• J.J. Thomson

• Ernest Rutherford

Group or family is the name for what part of the periodic table?

• Period

• Column

• Lower rows

• Diagonal

Which piece of information can be found in a square of the periodic table?

• Atomic number

• Chemical Symbol

• Atomic Mass

• All of the above.

How are the elements in the modern periodic table arranged?

• By atomic number.

• By atomic mass.

• By chemical symbol.

• By element name.

Why is the atomic mass of an element an average?

• Scientist are just guessing on the mass.

• It isn't an average.

• Most elements consist of a mixture of isotopes.