Chemistry Elements of life 0.0 / 5 ? ChemistryUnit 1ASOCR Created by: ChloesnCreated on: 28-02-14 09:20 10283145976 Across 1. Helium nuclei (42He), common among heavy elements with atomic no. 83+. It reduces the mass - the isotope produced will have a mass 4 units lower and nuclear charge 2 units lower. i.e 23892U → 23490Th + 42He (5, 9) 5. The mass of one mole is equal to the relative atomic mass in g. (5, 4) 6. The substances on the far left in an equation that react together to form a product/s. (9) 7. Vertical rows in the Periodic Table. Elements in a group show specific similarities. (6) 8. A package of energy (6) Down 2. Three groups of electrons result in bond angles of 120O - Ammonia NH3, 120O 3 bonding pairs, 1 lone pair. (9) 3. General formula - M(OH)2 . In water the ... form alkaline solutions, although they are not very soluble. Most strongly alkaline .... and oxides are thoses at the bottom of the group. More soluble as you go down. (10) 4. Electrons not involved in bonding are (4, 5) 9. Tells you the number of times an atom of an element is heavier than one-twelfth of an atom of 12C. Has no units. (3) 10. Four groups of electrons result in bond angles of 109O - Water H2O, 109O 2 bonding pairs, 2 lone pairs. (4)
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