Atomic Structure 3

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

• Atomos
• Dalton
• Democritus
• Thomson

Dalton's atomic theory included which idea?

• All atoms of all elements are the same size.
• Atoms of different elements always combine in one-to-one ratios.
• Atoms of the same element are always identical.
• Individual atoms can be seen with a microscope.

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 ____.

• protons and electrons
• protons and neutrons
• electrons and neutrons
• electrons only

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 58. The number of protons and electrons in a neutral atom of the element are ____.

• 116 protons and 58 electrons
• 58 protons and 0 electrons
• 29 protons and 29 electrons
• 58 protons and 58 electrons

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

Isotopes of the same element have different ____.

• positions on the periodic table
• chemical behavior
• atomic numbers
• mass numbers