The Periodic Table of Elements

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ACROSS:

3 - This element can be found in a variety of compounds that are used everyday. These include drain cleaner, bleach, baking soda, and table salt.

7 - This nonmetal is yellow in colour. It is found in natural petroleum. Copper and nickel ores contain this element. In the roasting of these ores, large amount of a compound of this element is released into the atmosphere. This contributes to the problem of acid rain.

9 - A Group VA element. The most abundant isotope of this element has 42 neutrons.

13 - This is the lightest of all the alkali metals.

15 - The oxide of this element is used in the manufacture of laboratory glassware, Pyrex.

16 - This element has the highest melting point of all the elements (3410 degree Celsius). You'll find this element if you find its symbol W.

18 - This element has 83 protons.

19 - The most abundant isotope of this element has 65 neutrons.

21 - This ground state of this element has completely filled first and second principal energy levels.

24 - The Latin name for the +4 charge of this element is stannic.

25 - This element is a gas. It likes to form ions with -1 charge. This ion is found in sea water and salt lakes.

26 - This element is dense. It is used in the manufacture of car batteries.

28 - The +4 ion of this element has 21 electrons.

31 - This element has 24 electrons.

34 - The electron configuration of this element ends with two electrons in the 2p sublevel.

35 - The most abundant isotope of this element has 20 neutrons.

36 - The most abundant isotope of this element has 117 neutrons.

39 - This metal is magnetic. The Latin name for its +3 charge ion is ferric.

40 - This element has 76 electrons.

41 - This element is used in medicine as an antacid, Milk of Magnesia.

42 - This gas make up part of the air that we breathe. Because it is less dense than air, this gas is also used to fill balloons so that they will float. Too much of this gas will make you talk like Donald Duck.

43 - This element like to form a +2 ion that has 28 electrons. In its ground state, this element has a completely filled 3d sublevel.

44 - A group IIIA element.

45 - This metal has a low density and is sufficiently strong. This combination makes this metal useful as a structural metal in airplanes and aerospace vehicles.

46 - The atom of this element has 58 electrons.

47 - The Latin name of this element is hydrargyrus meaning liquid silver.

DOWN:

1 - The symbol of this element came from Latin name of its ore, argentite.

2 - This nonmetal is a solid at room temperature. When the crystals are heated, they sublime into a violet vapour.

4 - The Latin name for the +1 charge of this element is cuprous.

5 - This is a transition metal with a mass number of 59.

6 - This is one of the seven diatomic elements. It makes up about 21% of the air that we breathe.

8 - This element is an ingredient in the manufacture of chlorofluororcarbons (CFC) that are used as refrigerants.

10 - This element likes to form a -2 ion that has an electron configuration like krypton.

11 - This is the most abundant element. We see it in a powdery form as sand on the beach.

12 - This metal has 1 electron in the 5th energy level.

14 - One of its isotopes is two times the mass of the most abundant isotope because it has one more neutron.

17 - The purity of this element is measured in units of karat. 24 karat is 100% pure.

20 - This nonmetal is located in Period 3 on the Periodic Table. The ground state electron configuration of this element has 3 electrons in its p sublevel.

22 - The +2 ion of this element has 28 protons.

23 - This is a noble gas located in Period 5 of the Periodic Table.

27 - This is a Group IIIA element with 66 neutrons.

29 - This inert gas is used in welding to prevent the welding joint from contacting oxygen.

30 - At room temperature this element is a dense dark red liquid.

32 - This is an alkaline earth metal with electrons in the 5th principal energy level.

33 - This element is the active ingredient in compounds such as ammonium nitrate that is used as a fertilizer.

34 - This alkali metal is used devices called atomic clocks to keep accurate time.

37 - In this element's ground state, it has 3 electrons in the 5d sublevel.

38 - A compound of this element is used in the building industry as wall plaster. It is called Plaster of Paris.