| 1 |
Which elements are called bridge elements?
|
Element of the third period <br>
Element of he second period <br>
Element of the first group <br>
Element of the second group<br>
|
| 2 |
Which of the these is not a noble gas
|
Argon <br>
Hydrogen<br>
Krypton <br>
Neon<br>
|
| 3 |
Who disproved the 'plum pudding' model of the atom?
|
Dalton <br>
Cavendish <br>
Ernest Rutherford <br>
Bohr<br>
|
| 4 |
What is the only element that normally has no neutrons?
|
Oxygen <br>
Hydrogen<br>
Krypton<br>
Neon<br>
|
| 5 |
Who disproved the Rutherford model of the atom?
|
Dalton <br>
Cavendish<br>
Langumir<br>
Bohr<br>
|
| 6 |
What is an empirical formula?
|
the mean mass of the atoms of an element<br>
The simplest ratio of atoms of each element in a compound<br>
the sum of protons and neutrons in the nucleus <br>
The actual numbers of atoms of each element in a compound<br>
|
| 7 |
German silver is an alloy of
|
Copper: 55 nickel: and zinc : 20<br>
copper: 25 nickel: 45 and zinc : 30<br>
copper: 25 nickel: 55 and zinc : 20<br>
copper: 15, nickel: 45 and zinc: 40<br>
|
| 8 |
What is the percentage of silver in German Silver (also known as nickel Silver)
|
100
0
50
25
|
| 9 |
Which of the these metals has the highest density?
|
Platinum <br>
Lithium <br>
Tungsten<br>
Iridium<br>
|
| 10 |
Which one of the following metals does not react with water produce hydrogen:
|
Sodium <br>
Potassium <br>
Lithium <br>
Cadmium<br>
|
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