Atoms Bell ringer

What is the basic unit of an element?

• atom

• compound

• cell

• molecule

What is the atomic number of an atom?

• The atomic number of an atom is the number of protons in the nucleus of the atom.

• The atomic number of an atom is the number of neutrons in the nucleus of the atom.

• The atomic number of an atom is the number of protons and neutrons in the nucleus of the atom.

• The atomic number of an atom is the number of electrons in the nucleus of the atom.

What is the atomic mass of an atom?

• The atomic mass of an atom is the average mass of all the isotopes of that element, taking into account their relative abundance.

• The atomic mass of an atom is the sum of the masses of all the isotopes of that element.

• The atomic mass of an atom is the average mass of all the electrons in that element.

• The atomic mass of an atom is the total number of protons and neutrons in the nucleus.

Who proposed the atomic theory?

• Albert Einstein

• Isaac Newton

• Marie Curie

• John Dalton

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

• electron number

• atomic number

• mass number

• isotope number

What is the charge of an electron?

• 1.6 x 10^-19 coulombs

• 0 coulombs

• 1.6 x 10^19 coulombs

• -1.6 x 10^-19 coulombs

What is the atomic theory based on?

• molecules

• cells

• energy

• atoms

What is the total number of electrons in a neutral atom?

• 1

• Infinity

• Depends on the element

• 0