Jihan Al Chami Week 6 Vocabulary period 9

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Across
  1. 3. A subatomic particle that has no charge and that is located in the nucleus of an atom.
  2. 6. The number of protons in the nucleus of an atom,the atomic number is the same for all atoms of an elements.
  3. 9. In nuclear physics,the sum of the numbers of protons and neutrons present in the nucleus of an atom.
  4. 10. An arrangement of the elements in order of their atomic numbers such that elements with similar properties fall in the same column,or group.
Down
  1. 1. A subatomic particle that has a negative charge.
  2. 2. The smallest unit of an element that maintains the properties of that element.
  3. 4. In chemistry,a column in the periodic table of the chemical elements.In a group,the chemical elements have atoms with identical valence electrons counts and identical valence vacancy counts.
  4. 5. A subatomic particle that has a positive charge and that is located in the nucleus of an atom,the number of protons in the nucleus is the atomic number,which determines the identify of an element.
  5. 7. Is a horizontal row of the periodic table.There are seven periods in the periodic table,with each one beginning at the far left.A new period begins when a new principal energy level begins filling with electrons.
  6. 8. A substance that cannot be separated or broken down into simpler substances by chemical means.