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The periodic table.

The periodic table is a systematic way to organize Earth's elements, substances that consist of atoms of only one kind. Today, there are 112 known and named chemical elements, Elements are arranged according to their increasing atomic numbers. Hydrogen (H), for example, has an atomic number of 1 and is the lightest known natural element on Earth. Scientists have created elements with atomic numbers greater than 92, but they don't exist naturally. Some scientists think they may have created elements heavier than 112, but until an element is confirmed by two different labs, it usually isn't listed on the periodic table.

it's your choice

Test your chemistry IQ! Answer the following questions <TI>The periodic table. about elements and the periodic table.</TI>

1. Name that element! --

2. The elements in groups 3 to 12 are called

A transition metals.

B noble gases.

C alkali metals.

D nonmetals.

3. The center of an atom is called its

A proton.

B neutron.

C nucleus.

D electron.

4. Which element is a member of the same group as fluorine (F)?

A Sulfur (S)

B Iodine (I)

C Silicon (Si)

D Lithium (Li)

5. Elements that are good at transmitting an electrical charge are called

A alloys,

B minerals.

C conductors.

D metals.

6. If silver (Ag) were to lose two protons, it would have the same atomic number as which element?

A Oxygen (O)

B Arsenic (As)

C Mercury (Hg)

D Rhodium (Rh)

7. -- has an average atomic mass that's greater than zinc's (Zn).

A Argon (Ar)

B Gold (Au)

C Potassium (K)

D Carbon (C)

A cloud of 29 electrons Orbit the mystery Elements



1. Cooper (CU)

2. a

3. c

4. b

5. c

6. d

7. b
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Publication:Science World
Date:Oct 9, 2006
Previous Article:Name that element!
Next Article:Explain this!

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