PLEASE HELP WILL GIVE BRAINIESRT #OFPROTONS #OFNUTRONS ATOMIC# MASS# ELEMENTSYMBOL
20 20 A B C
9 D E 19 F
Using the periodic table, complete the table to describe each atom. Type in your answers.
A=
B=
C=
D=
E=
F=

A=20

B=40

C=Ca

D=10

E=9

F=F

The Atomic Number (Z) indicates the number of protons in an atom of an element. If the atom is neutral then the number of protons will be equal to the number of electrons. So the atomic number can also indicate the number of electrons.

So atomic number = number of protons = number of electrons

Mass Number (A) is the sum of protons and neutrons

Mass Number (A) = Number of protons + Number of Neutrons

So that the relationship between atomic numbers and mass numbers can be formulated as follows:

Atomic Number (Z) = Mass Number (A) - Number of Neutrons

A=atomic number=number of protons=20

B=mass number=protons+neutrons=20+20=40

C=the element with atomic number 20 and mass number 40 is Ca,

D=number of neutrons=mass number-number of protons =19-9=10

E=atomic number=number of protons=9

F=the element with atomic number 9 and mass number 19 is F

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