Completar frases Pre-Assessment CheckVersión en línea Fill in the blanks with the correct answer. por Charlene Dinawanao 1 All substances are made up of matter and the fundamental unit of matter is the . The atom constitutes the smallest particle of a / an . The atom is made of a central nucleus containing ( positively - charged ) and ( with no charge ) . The ( negatively - charged with negligible mass ) revolve / s around the nucleus in different imaginary paths called orbitals or shells .
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