Chemistry Unit 3
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What is the Atomic Weight and Atomic Number of an element?
The Atomic weight is the sum of protons and neutrons on the nucleus
The Atomic Number is the number of elecrons in orbit around the nucleus and also the number of neutrons in the nucleus.
Who invented the modern Periodic Table?
The Russain chemist Dmitri Mendeleev
What is so special about Transition Elements
Transition Elements can give away any number of electrons from their outer shell so they can form differnet componds with the same element.
Name the 4 main Halogens in order of reactivity.
What is the symbol equation for Sodium (Na) and Chlorine (Cl)
2Na + Cl2 ⇾ 2NaCl
What is the differnce between 'Hard Water' and 'Soft Water'?
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