Me ayudan xfa, doy corona :) 1) ¿Qué es un modelo atómico?
2) ¿A qué se llama número atómico y número másico?
3) ¿A qué se llama elemento?
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What are the percent by mass of copper in penny lab

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

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