Atomic Structure

Atoms are the smallest particles of matter.

• True

• False

Identify which of the following best describes the structure of an atom.

• A nucleus that is mostly empty space with charged particles circling around it

• A neutral nucleus circled by particles with positive and negative charges

• A positively charged nucleus circled by widely spaced negatively charged particles

Classify the subatomic particle labeled A.

• A proton

• A neutron

• A nucleus

• An electron

Tags

NGSS.MS-PS1-1

For the atom shown in the diagram above, determine which two of the following have a similar mass.

• A proton

• A neutron

• An electron

• The nucleus

Tags

NGSS.MS-PS1-1

An atom is electrically neutral if it has equal numbers of:

• neutrons and electrons

• protons and electrons

• protons and neutrons

In all atoms, the number of protons is the same as the:

• mass number

• atomic number

• number of neutrons

Any two atoms that have the same number of protons:

• have the same overall charge

• belong to the same element

• belong to the same isotope

• have the same mass number

Complete the equation: mass number =

• number of neutrons + number of protons

• number of protons

• number of protons + number of electrons

Of the atoms shown above, categorize those which are electrically neutral.

• Atom A

• Atom B

• Atom C

• None of them

Tags

NGSS.MS-PS1-1

Atom B differs from Atom A by having one more neutron. Determine what this means.

• Atom B has a higher mass number

• They are different elements

• They are different ions of the same element

• They are different isotopes of the same element

Tags

NGSS.MS-PS1-1