2022 ~ Final Review Part 1a

When two or more atoms differ only in the number of neutrons that each contains, what property or properties change?

• mass, only

• charge, only

• mass and charge

• none of these

The isotope oxygen-18 has an atomic number of 8. Which of the following shows the correct number of protons, electrons, and neutrons, respectively, in a neutral oxygen-18 atom?

• 8, 8, 10

• 10, 10, 8

• 8, 10, 10

• 8, 8, 8

In Rutherford's gold foil experiment, which of the following proved that the nucleus of an atom has a positive charge?

• Some of the alpha particles were absorbed by the foil.

• Most of the alpha particles passed straight through the foil.

• The alpha particles, being positively charged, were deflected by the nucleus

• none of these

In Rutherford's gold foil experiment, which of the following proved that the atom must be mostly empty space?

• Some of the alpha particles were absorbed by the foil.

• Most of the alpha particles passed straight through the foil.

• The alpha particles, being positively charged, were deflected by the nucleus

• none of these

The smallest particle of an element that still represents that element.

• Nucleus

• electron

• proton

• atom

What can you conclude from the fact that scientists continue to update the atomic model?

• New information about atoms continues to be discovered
• Old information about atoms is completely useless
• Scientists did not have any information about atoms until a few years ago
• Scientists still have no idea what atoms look like

John Dalton stated:

• elements are made of atoms
• atoms of a given element are identical
• atoms cannot be subdivided, created, nor destroyed
• all of the above

A tiny but very dense, positively charged portion of the atom that holds most of the atomic mass

• Electron Shells
• Orbitals
• Electron Cloud
• Nucleus

How many protons does this isotope of titanium have?

• 48
• 22
• 26
• 70

What is the approximate mass of an atom that contains 26 protons, 26 electrons and 19 neutrons?

• 26 amu

• 45 amu

• 52 amu

• 71 amu