The smallest piece of matter The smallest piece of matter The smallest piece of matter The center of the atom The center of the atom The center of the atom A positively charged subatomic particle found in the nucleus of an atom. A positively charged subatomic particle found in the nucleus of an atom. A positively charged subatomic particle found in the nucleus of an atom. A neutral subatomic particle found inside the nucleus of an atom. A neutral subatomic particle found inside the nucleus of an atom. A neutral subatomic particle found inside the nucleus of an atom. A negatively charged subatomic particle found outside the nucleus in the electron cloud. A negatively charged subatomic particle found outside the nucleus in the electron cloud. A negatively charged subatomic particle found outside the nucleus in the electron cloud. Equal to the number of protons or electrons in a neutral atom. Equal to the number of protons or electrons in a neutral atom. Equal to the number of protons or electrons in a neutral atom. The sum of the neutrons and protons in an atom’s nucleus. The sum of the neutrons and protons in an atom’s nucleus. The sum of the neutrons and protons in an atom’s nucleus. A version of an element that has a different number of neutrons. A version of an element that has a different number of neutrons. A version of an element that has a different number of neutrons. A vertical column on the periodic table, elements all have similar properties. A vertical column on the periodic table, elements all have similar properties. A vertical column on the periodic table, elements all have similar properties. A horizontal row on the periodic table, elements all have the same number of energy levels in their electron cloud. A horizontal row on the periodic table, elements all have the same number of energy levels in their electron cloud. A horizontal row on the periodic table, elements all have the same number of energy levels in their electron cloud.
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