7The smallest chemical units of matter are a) atoms c) protons e) electrons b) m

Question

7The smallest chemical units of matter are a) atoms c) protons e) electrons b) molecules d) neutrons 2. Which of the following would have the largest size? a) an atom c) a proton e) an electron b) a molecule d) a neutron 3. Isotopes of an element differ in the number of a) protons in the nucleus b) electrons in the nucleus c) neutrons in the nucleus d) electron clouds e) energy levels they contain H. The atomic number a) protons in an atom c) neutrons in an atom e) neutrons and electrons b) electrons in an ion d) protons and neutrons 5 All atoms with the same atomic number are grouped into a) molecules c) compounds e) none of the above b) cells d) elements

Explanation / Answer

1) The smallest chemical units of matter are:

A) Atoms

2) Which of the following would have the largest size?

B) A molecule

3) Isotopes of an element differ in the number of:

C) Neutrons in the nucleus

4) The atomic number represents the number of:

A) Protons in an atom

5) All atoms with the same atomic number are grouped into:

D) Elements

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