1) Which subatomic particle has a positive charge? a) Electron b) Neutron c) Proton d) Isotopes3 2) Which particle is found outside the nucleus? a) Proton b) Electron c) Neutron d) Nucleus 3) Which subatomic particle has no charge? a) Proton b) Electron c) Neutron d) Ion 4) Where are protons and neutrons located? a) Electron cloud b) Orbitals c) Shells d) Nucleus 5) What makes an atom neutral? a) more protons than electrons b) More electrons than neutrons c) equal number of protons and electrons d) equal number of neutrons and electrons 6) The atomic number represents the number of ________. a) Electrons only b) Neutrons only c) Protons only d) Proton + Electrons 7) The mass number of an atom is the total number of ________. a) Protons only b) Neutrons only c) Protons and Neutrons only d) Neutrons and Electrons only 8) What is the charge of an electron? a) Positive b) Negative c) Neutral d) Double Positive 9) In the notation on ¹⁹K³⁹, the number 19 refers to the ______. a) Mass Number b) Atomic Number c) Neutron Number d) Electron Shell 10) How many neutrons does ¹⁹K³⁹ have? a) 5 b) 10 c) 15 d) 20 11) Electrons are important because they ________. a) add mass to the nucleus b) determine the chemical bonding and reactions c) identify the element d) make isotopes 12) An atom with 20 protons, 20 neutrons, and 20 electrons is ______. a) a charge of an ion b) neutral c) an isotopes d) radioactive 13) What do neutrons mainly contribute to the atom? a) Charge b) Bonding c) Mass d) Color 14) Which subatomic particle determines the identity of an atom? a) Electron b) Proton c) Neutron d) Isotope 15) In a neutral atom, the number of electrons is equal to the number of ______. a) Protons b) Neutrons c) Mass Number d) Isotopes

GRADE 8 SCIENCE

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