Biology 201

select all of the following that are true about atoms that have partially filled energy shells.

-tend to share, lose , or gain electrons. -can form compounds

ranking the folllowing electrons from lowest energy level at the top to highest energy level at the bottom: electrons in 2s electrons in 2p electrons in 1s

1. a pair of electrons in 1s 2. a pair of electrons in 2s 3. a pair of electrons in 2p

carbon has six electrons. how many valence electrons does it have?

4

what is a chemical element?

a pure substance composed of only one type of atom

the fundomental unit of matter is the?

atom

the smalles functional unit of matter is the?

atom

in this diagram what letter in electron

c- outer shell

the region of space surrounding an atomic nucleus in which there is a high probability of finding a(n) ________ is called an orbital

electron

which of the following best describes a contemporary model of electron movement within atoms?

electrons move in orbitals where the probability of finding them is high

the capacity to do work is known as:

energy

within in atoms structure, electrons can be found:

in a cloud like orbitals

which subatomic particles are confined to a small volume within the nucleus of an atom

neutrons and protons

what are the three subatomic particles?

neutrons, electrons, protons

due to the presence of protons and atom's ______ has a net positive electrical charge

nucleus

how many types of atoms can be found in a single element

one

valence electron are found in?

outermost energy shells

atoms of different chemical elements can be differentiated based on the number of which subatomic particle?

proton

Atom contains three types of particles, positively charged _____, negatively charged ______, and uncharged_____

protons, electrons, and neutrons

elements are electronically neutral because:

there are equal numbers of protons and electrons in a given Atom

a molecule is composed of:

two or more atoms bonded together