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