Across
- 3. A subatomic particle that has no charge and is located in the nucleus of an atom
- 6. The number of protons in the nucleus of an atom the atomic number is the same for all atoms of an element
- 9. The sum of the numbers of protons and neutrons present in the nucleus of an atom
- 10. An arrangement of elements in their atomic numbers such that elements with similar properties fall in the same column or group
Down
- 1. A subatomic particle that has a negative charge
- 2. The smallest unit of an element that maintains the properties of that element
- 4. A column in the periodic table of the chemical elements
- 5. A subatomic particle that has a positive drive and that is located in the nucleus of an atom; the number of protons in the nucleus which determines the identity of an element
- 7. A period 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. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements
- 8. A substance that cannot separated or broken down simpler substance by chemical means