الحسن يحيى
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the atom is electrically (neutral) because the number of (protons) in nucleus is equal to number of(electrons) Note:electrons are (negative) and Thanks!
when a solid material is heated it's intermolecular space (increase) and it's intermolecular force (attraction) ( DECREASE ! ) thanks!
because the mass = protons + neutrons
while atomic number = protons ONLY
NOTE: protons in nucleus = electrons
