The First 20 Elements
1. The sum of the number of protons and neutrons results in an atom's
approximate
.
2. A scientist finds that a sample of matter contains three types of atoms. Give 2
possible answers . (a compound/ a mixture /an element /a molecule)
3. What do you call a row on the Periodic Table of Elements? _____________
4. What 2 things do the numbers inside the box of an element on the Periodic Table
of Elements represent?_________________________________
______________________________________________
5. Name 3 element symbol will have both upper case letters and lower case
together. _______________________________________
6. The periodic table of elements is a chart that lists all of the known elements in
order of their atomic number. (True/ False)
7. Guess the metal: ____________
Clue 1: I am a gray metal that doesn't rust.
Clue 2: I am strong, light and one of the most commonly found metals in Earth's
crust.
Clue 3: I am used to make airplanes, drink cans and cooking foil
8. Which element is an example of a rare earth element?
(Magnesium /Calcium /Sodium /Uranium)
9. When looking at the Periodic Table of elements, symbols don't match the name
(like Ag=silver). Why is there such inconsistency? _________________________
______________________________________
10. How many protons does an atom of aluminum have? __________
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Prepared by : Thilani Ruapatunge
11. What is represented by the atomic number of an element?__________________
_____________________________
12. Write 3 noble gases. __________________________
13. Guess the metal: ____________________
Clue 1: I am an unreactive metal and was first discovered around 5000 BC.
Clue 2: I am very expensive.
Clue 3: I am used to make jewelry
14. Guess the gas: _________________
Clue 1: I am a colourless gas that is lighter than air.
Clue 2: I am very non-reactive and am used in balloons.
Clue 3: I can make your voice go very high pitched.
15. Elements that have larger atomic numbers than 92 do NOT occur naturally.
(True /False)
16. "Noble gases" got their name because they are atoms that usually do not
________________
with any other atoms.
17. What is the atomic number for sodium?__________
18. Guess the element. ____________
Clue #1 - I am a noble gas.
Clue #2 - I glow blue when an electric current is applied.
Clue #3 - I am the third most abundant gas that makes up air.
Clue #4 - I have 18 electrons.
19. Graphite in a pencil lead is made of the element _____________.
20. What is a poisonous green gas which attacks the lungs? ______________
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Prepared by : Thilani Ruapatunge