An element has 4 protons, 5 neutrons, and 4 electrons. What is the atomic mass of the
4,5,8,9

Atomic mass formula is=neutron+proton

Answer is11

Explanation:

Atomic mass=proton+neutron

=4+5

=11

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each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.