Atoms

Who was the man who lived from 460 B.C. - 370 B.C. and was among the first to suggest the idea of atoms?

• Atomos

• Dalton

• Democritus

• Thomson

The smallest particle of an element that retains the properties of that element is a(n)

• atom

• electron

• proton

• neutron

All atoms are

• positively charged with the number of protons exceeding the number of electrons

• negatively charged with the number of electrons exceeding the number of protons

• neutral with the number of protons equaling the number of electrons

• neutral with the number of protons equaling the number of electrons which is equal to the number of neutrons

The particles that are found in the nucleus of an atom are

• neutrons and electrons

• electrons only

• protons and neutrons

• protons and electrons

The nucleus of an atom is

• the central core and is composed of protons and neutrons

• positively charged and has more protons than neutrons

• negatively charged and has a high density

• negatively charged and has a low density

The atomic number of an element is the total number of which particles in the nucleus?

• neutrons

• protons

• electrons

• protons and electrons

An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are

• 152 protons and 76 electrons

• 76 protons and 0 electrons

• 38 protons and 38 electrons

• 76 protons and 76 electrons

The sum of the protons and neutrons in an atom equals the

• atomic number

• nucleus number

• atomic mass

• mass number

What does the number 84 in the name krypton-84 represent?

• the atomic number

• the mass number

• the sum of the protons and electrons

• twice the number of protons

All atoms of the same element have the same

• number of neutrons

• number of protons

• mass numbers

• mass