Fundamentals of Chemistry Class 7

What is the smallest unit of an element?

• cell

• atom

• molecule

• nucleus

Who discovered the electron?

• Isaac Newton

• J.J. Thomson

• Marie Curie

• Albert Einstein

What is the charge of a proton?

• Positive

• Neutral

• Zero

• Negative

How many electrons can the first energy level hold?

• 4

• 6

• 8

• 2

What is the atomic number of carbon?

• 5

• 7

• 8

• 6

What is the mass number of an atom?

• Total number of neutrons

• Total number of protons + total number of neutrons

• Total number of electrons + total number of protons

• Total number of protons

• Total number of electrons

What is the total number of protons and neutrons in an atom called?

• Nuclear number

• Element number

• Atomic number

• Mass number

What is the atomic mass unit (amu) used for?

• Determining electrical charge

• Measuring temperature

• Expressing the relative masses of atoms and molecules.

• Calculating volume

What is the electron configuration of oxygen?

• 1s2 2s2 2p4

• 1s2 2s1 2p5

• 1s2 2s3 2p3

• 1s2 2s4 2p2

What is the name of the model that represents the atom as a positively charged nucleus surrounded by electrons?

• Bohr model

• Dalton model

• Rutherford model

• Thomson model