If an atom has 47 protons and 55 neutrons, what is its mass #

[From: ] [author: ] [Date: 11-11-29] [Hit: ]

Electrons weigh 1/1836 of a proton, so thats why they are basically excluded.......

i know about the protons and neutrons and stuff like on the perdioc table so yeah oh yeah imma freshman in hs and this is chimistry.. PLEASE CAN SOMEONE HELP ME

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Just add the two numbers up for the mass #. a proton and a neutron are each considered 1 atomic mass unit. so the mass # is 102. Electrons weigh 1/1836 of a proton, so thats why they are basically excluded.

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basically you add the numbers:
102amu or grams/mole

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