Asked Feb 6, 2020
Write the complete symbol, including mass number and atomic number, for each atom.
contains 28 protons28 protons and 30 neutrons30 neutrons:
contains 22 protons22 protons and 21 neutrons21 neutrons:
contains 15 electrons15 electrons and 19 neutrons19 neutrons
an oxygen atom with 10 neutrons10 neutrons:
a chromium atom with a mass number of 5454:

Expert Answer


Atomic number: The atomic number (represented by the letter Z) of an element is the number of protons in the nucleus of each atom of that element.

Mass number: The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom.

The composition of any atom can be illustrated with a shorthand notation called A/Z format. Both the atomic number and mass are written to the left of the chemical symbol. The "A" value is written as a superscript while the "Z" value is written as a subscript.

Mass number = number of protons + number of neutrons.

Symbol of elements.

Chemistry homework question answer, step 1, image 1

1. Writing the symbol for an element with 28 protons and 30 neutrons:

Atomic number (Z) = 28

Mass number = number of protons + number of neutrons.

Mass number (A) = 28 + 30 = 58

Symbol of element is given by,

Chemistry homework question answer, step 2, image 1

2. Writing the symbol for an element with 22 protons and 21 neutrons:

Atomic number (Z) = 22

Mass number = number of protons + number of neutrons.

Mass number (A) = 22 + 21 = 43

Symbol of element is given by,

Chemistry homework question answer, step 3, image 1


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