Biology review - semester exam

In biology, "organic" means anything that contains ____

• carbon

• oxygen

• hydrogen

• nitrogen

Tags

NGSS.HS-LS1-6

NGSS.HS-LS2-5

The prefix "macro-" means _____

• tiny

• large

• highly reactive

Tags

NGSS.HS-PS3-2

True or False: Isotopes are atoms with the same number of protons, but a different number of neutrons.

(Example: C¹² and C¹⁴ )

• True

• False

An ___ is an atom that has gained or lost an electron.

• ion

• isotope

• electron

• nucleus

An atom has an equal number of ______ and ______ in the nucleus.

• protons and neutrons

• neutrons and electrons

• protons and electrons

Gallium has has an atomic number of 31, and an atomic mass of 70. This makes Gallium an ____

• isotope

• ion

• atom

Atomic mass = number of protons + number of _____

• neutrons

• electrons

Aluminum has an atomic number of 13, and an atomic mass of 27. How many neutrons does it have?

• 13

• 14

• 27

• 40

Tags

NGSS.MS-PS1-1

Because Aluminum has an unequal number of protons and neutrons, Aluminum is an ____.

• atom

• ion

• isotope

Orbital rules state that the 3rd orbital shell needs at least ___ electrons to be stable, but ___ to be full.

• 2, 8

• 8, 8

• 8, 16