1. The mass number of a nucleus is ________________________________.
[A]The sum of the number of protons and neutrons present in the nucleus
[B]Always less than its atomic number
[C]A fraction
[D]Always more than its atomic number
2. The material that can be permanently deformed by heat and pressure is called _________________.
[A]Polymer
[B]Thermostat
[C]Thermoplasticxdddddddddddddd[D]Chemical compound
3. What is the maximum number of covalent bonds formed by nitrogen?
[A]4
[B]6
[C]3
[D]2
4. Which metal is usually extracted from sea water?
[A]Potassium
[B]Magnesium
[C]Sodium
[D]Calcium
5. What is the method of concentrating the ore which makes use of the difference in density between ore and impurities called?
[A]Liquation
[B]Leaching
[C]Levigation
[D]Magnetic Separation
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