1)
chlorine is the atomic number 17 in the periodic table of elements. what information does the atomic number give you about the element chlorine?
a) an atom of chlorine has 17 protons+.
b) an atom if chlorine has 17 protons+ and electrons-.
c) an atom of chlorine has 17 protons+ and 17 neutrons+.
d) chlorine atoms have 17 of each of the three subatomic particles, protons, neutrons, and electrons.

2)
consider the information you have about the element chlorine in question #1. based on that knowledge, what do you know about the atomic structure of aluminum? all but one statement is true.
a) aluminum has 13 neutrons.
b) aluminum has an atomic number of 13
c) aluminum has 13 protons+ in the nucleus.
d) the number of protons equals the number of electrons.

1. A) An atom of chlorine has 17 protons.

2. D) The number of protons equals the number of electrons.

Explanation:

1. Atomic number is defined as the number of protons or number of electrons that are present in an atom.

For an electrically neutral atom,

Atomic number = Number of electrons = Number of protons  

As atomic number of chlorine is 17, it has 17 protons and 17 electrons. It can any any number of neutrons depending on the isotope.

2.

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.

Number of protons of aluminium = 17

Number of electrons of aluminium = 2=8+7 = 17

Mass number = Number of protons + Number of neutrons  = 17 +18 = 35

Number of protons of aluminium  = Number of electrons of aluminium = 17

Thus atomic number of aluminium is 17 and Number of protons of aluminium  = Number of electrons of aluminium

magnitude and direction

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