1.which subatomic particle is located outside the nucleus?
select one:
a. proton
b. neutron
c. electron
d. quark

2.the atomic number of an atom is also equal to which quantity?
select one:
a. the number of protons
b. the number of neutrons
c. the number of protons + the number of neutrons
d. the number or protons + the number of electrons

3.what is the atomic mass of oxygen?

periodic table
select one:
a. 6
b. 8
c. 16
d. 24

4.isotopes differ from each other because they
select one:
a. have different properties
b. have different electron configuration
c. have a different number of protons
d. have more or fewer neutrons

5.what do we call a pure substance that contains many identical atoms?
select one:
a. an element
b. a compound
c. an isotope
d. a radioactive substance

6.which of these statements is true of stable atoms?
select one:
a. they have an equal number of protons and neutrons.
b. they have an equal number of electrons and protons.
c. they have an equal number of neutrons and electrons.
d. they are constantly losing or gaining particles.
7.compared to the charge and mass of a proton, an electron has
select one:
a. the same charge and a smaller mass
b. the same charge and the same mass
c. an opposite charge and a smaller mass
d. an opposite charge and the same mass

8.which symbols represent atoms that are isotopes of an element?

periodic table
select one:
a. c-14 and n-14
b. o-16 and o-18
c. i-131 and i-131
d. rn-222 and ra-222

9.which atom contains exactly 15 protons?

periodic table
select one:
a. p
b. s
c. o
d. n

10.what do we call 2 or more substances bonded together that have properties different from the elements that make them up?
select one:
a. mixture
b. compound
c. element
d. acids

11.an element can have multiple isotopes. each of the different isotopes of the same element has a different:
select one:
a. number of electrons
b. number of protons
c. mass number
d. atomic number

12.carbon and oxygen are in metabolic studies because:
select one:
a. they are inexpensive elements
b. they are incorporated into organic material and common found in living things
c. scientists know a lot about these two elements
d. they are plentiful in nature

13.carbon-14 is widely used in radiometric dating.
select one:
true
false