Across
- 2. Electrical charge of the atom with an equal number of protons and electrons
- 3. This poisonous gas is given the chemical symbol ‘Cl’
- 7. The lightest element on the Periodic Table
- 9. A substance made of only one type of atom
- 10. The name of the ion formed when chlorine gains one electron
- 14. Particles inside the nucleus of an atom that have no charge
- 18. Name for the ‘ingredients’ of a chemical reaction
- 21. Mg2+
- 22. Name of the compound with the formula NaOH
- 25. Name for the substances that are produced in a chemical reaction
- 26. This number, found above an element on the Periodic Table, tells you the number of protons inside that atom
Down
- 1. Positively charged particle in the nucleus of an atom
- 4. This element has an electron arrangement of 2,8
- 5. Negatively charged particle that surrounds the nucleus of an atom
- 6. Number of atoms in a single H2SO4 molecule
- 8. Number of electrons in a sodium atom
- 10. Name of the compound with the formula CaSO4
- 11. This element has an atomic number of 8
- 12. Building block of all matter
- 13. This element is given the chemical symbol ‘K’
- 15. O2-
- 16. The middle of an atom is called this
- 17. The element has an electron arrangement of 2,8,3
- 19. Made of two or more elements chemically combined
- 20. The group number for an element with four electrons in its outer shell
- 23. Used to show the direction of a chemical reaction when writing equations
- 24. Table used to arrange all the known elements
- 27. This element has an atomic number of 6