Question

practice: atom and the periodic table vocabulary
match the terms below to the correct definitions.

1. the mass on the periodic table.
2. region surrounding the nucleus where electrons are found.
3. positively charged center of an atom.
4. particles that differ in number between isotopes.
5. vertical column in the periodic table.
6. positively charged particles in an atom.
7. negatively charged particles in the outermost energy levels of the electron cloud.
8. table that organizes the elements by properties.
9. atoms of the same element that have different masses.
10. smallest known particle that makes up protons and neutrons.
11. all elements in the same one of these has the same number of energy levels in their electron cloud.
12. the smallest form of matter that still retains the properties of an element.
13. negatively charged particles in an atom.
14. the sum of protons and neutrons in an atom.
15. represents the identity of an element.

a. atom
b. electrons
c. protons
d. neutrons
e. electron cloud
f. nucleus
g. quark
h. atomic number
i. mass number
j. average atomic mass
k. isotopes
l. valence electrons
m. group
n. period
o. periodic table

Explanation:

Match terms to definitions based on atomic and periodic - table knowledge.

Answer:

1. j. Average atomic mass
2. e. Electron cloud
3. f. Nucleus
4. d. Neutrons
5. m. Group
6. c. Protons
7. l. Valence electrons
8. o. Periodic Table
9. k. Isotopes
10. g. Quark
11. n. Period
12. a. Atom
13. b. Electrons
14. i. Mass number
15. h. Atomic number