Atoms, Ions and Isotopes

Review

Properties of sub-particles

• neutral atom has no overall net charge
• number of protons = number of electrons

The atomic Number (number of protons)

• protons found in nucleus
• IF no electric charge
• atomic number=number or protons=number of electrons
• if a proton is added to an elements nucleus, a new element will be produced

Ions

• most atoms can gain or loose electrons
• few elements (ex. hydrogen) can gain or loose both
• atoms that gain or loose electrons care called Ions
• ion is an electricity charge atom
• negatively charged normally non-metal
• positively charge tend to be metals

Mass Number

Mass number:  total number of protons and neutrons or atomic mass number

• number of neutrons= mass number-atomic number  OR atomic mass - atomic number
• atomic number(pro.)= mass number-electrons
• atomic mass=average of all isotopes
• mass number= round number of atomic mass
• MASS NUMBER DOES NOT EQUAL ATOMIC MASS

Isotopes

• neutron is added to an elements nucleus which makes a heavier version of the same element
• same element with bigger atomic mass
• same number of protons and electrons
• different number of neutrons so different atomic mass

For example, if you had Calcium-41, how many neutrons would there be?

Calcium-41 = Calcium with an atomic mass of 41

Calcium       = atomic number is 20 (20 protons)

                       atomic mass= protons + neutrons

                    = n + 20 = 41

                       so there are 21 neutrons

                             there is no charge listed so assume 

                                 number of electrons= number of protons

                                 Your done :)

Review Isotopes!

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