Atoms and Atomic Structure

What do scientists use to predict the location of electrons in atoms?

• Probability

• Geometry

• Algebra

• Ratios and Proportions

Tags

NGSS.HS-PS1-1

Which model of the atom first introduced the concept of electron orbits?

• Dalton's Model

• Bohr's Model

• Thomson's Model

• Rutherford's Model

Which subatomic particle determines the identity of an element?

• Electron

• Neutron

• Proton

• Quark

What is the significance of the atomic number in the periodic table?

• It determines the isotope of the element.

• It shows the total mass of the atom.

• It indicates the number of protons in an atom.

• It represents the number of neutrons in an atom.

Dalton's theory did NOT include which of the following points?

• All elements are composed of atoms.

• Most of the atom's mass is in its nucleus.

• Compounds contain atoms of more than one element.

• In a specific compound, atoms of different elements always combine in the same way.

JJ Thompson's experiments provided the first evidence of

• atoms

• a nucleus

• subatomic particles

• elements

In which way do isotopes of an element differ?

• Number of electrons in the atom.

• Number of protons in the atom.

• Number of neutrons in the atom.

• Net charge of the atom.

Tags

NGSS.HS-PS1-8

Of the three subatomic particles that form the atom, the one with the smallest mass is the neutron.

• True

• False

Which statement is true about Oxygen-17 and Oxygen-18?

• They do not have the same number of protons.

• Their atoms have an identical mass.

• They are isotopes of oxygen.

• They have the same mass number.

What is the charge of a neutron?

• Positive

• Negative

• Neutral

• Variable