Question

understanding checkpoint atoms

1. atoms are the basic building block for all __________ in the universe.
2. an element is determined by the number of

a. protons b. neutrons
c. electrons d. atoms

1. most of the mass of an atom is concentrated in the

a. electrons b. electron cloud
c. nucleus d. none of these

1. which statement best describes an electron?

a. smaller than proton and negative charge
b. larger than proton and negative charge
c. smaller than proton and positive charge
d. larger than proton and positive charge

1. an atom has a neutral charge (zero charge) if it contains the same number of what two particles?

a. neutrons and protons
b. protons and neutrons
c. electrons and protons
d. electrons and neutrons

1. the current atomic model has electrons orbiting the nucleus in a(n) __________

identify the following components of an atom.
7.
8.
9.
10.

Explanation:

1. Atoms are the basic building - blocks of matter.
2. The number of protons determines the element.
3. Most of an atom's mass is in the nucleus.
4. Electrons are smaller than protons and have a negative charge.
5. An atom is neutral when it has equal numbers of electrons and protons.
6. Electrons orbit the nucleus in an electron cloud.

7 - 10: The empty circle represents a neutron (neutral charge), the negative - sign represents an electron (negative charge), the cluster represents the nucleus (contains protons and neutrons), and the positive - sign represents a proton (positive charge).

Answer:

1. matter
2. a. protons
3. c. nucleus
4. a. Smaller than proton and negative charge
5. c. Electrons and Protons
6. electron cloud
7. Neutron
8. Electron
9. Nucleus
10. Proton