Atomic Mass and Atomic Number | calculate number of neutrons | Chemistry
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Atomic Mass and Atomic Number
Atomic Mass and Atomic Number | Easy Explanation | Chemistry
Science 9 - Unit B: Matter & Chemical Changes
Atomic number is the number of protons (p+) in an element. The number above the element’s symbol is the atomic number. Atoms are neutral (not charged) which means the number of protons is equal to the number of electrons (e-)
The atomic number also tells you how many electrons are in an atom of a particular element
Atomic number increases by one for each element as you read
across the periodic table from left to right.
Atomic mass is measured by atomic mass unit (amu). The number below the element’s symbol is the atomic mass. The atomic mass tells you the total mass of all the protons (p+) and neutrons(n 0) in an atom.
Atomic mass increases when moving left to right across a period.
Mass number = # of p+ + # of n0 (Sum of the number of protons and number neutrons)
To Calculate the number of neutrons, we subtract the atomic number from the mas number.
of neutrons = mass # - atomic #
Solutions for the practice problems:
Number of Neutrons for
Argon 22
Magnesium 12
Uranium 146
Silicon 14
Chromium 28
Titanium 26
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