Do not refer to the text when taking this test An element ha

Do not refer to the text when taking this test. An element has an atomic number of 11 and an atomic weight of 23. Its number of neutrons is a. 11. b. 12. c. 23. d. 24. The atom of an clement has 1 proton and 2 neutrons. Its atomic number is a. 1. b. 2. c. 3. d. 6. The atom of an element has 6 protons and 8 neutrons. The number of electrons in this atom is a. 6. b. 8. c. 12. d. 14. The relationship between _3^12C and _6^12C is that they are a. molecules. b. isomeres. c. isotopes. d. polymers. An atom has 11 electrons and 12 neutrons. Its atomic weight is a. I. b. II. c. 12. d. 23. The energy possessed by electrons in the K shell is_____ than the energy possessed by electrons in the L shell. a. greater b. less An element has an atomic number of 14. Its electron distribution over several energy shells is a. 1-4-8. b. 1-8-5. c. 2-8-2. d. 2-8-4. An element has an atomic number of The number of electrons in its L energy shell is a. 1. b. 2. c. 4. d. 8 Select the reactive element by atomic number. a. 2 b. 10 c. 12 d. 18 Select the inert element by its atomic number a. 1 b. 8 c. 10 d. 16 Select the compound. a. Ca b. H c. NaCI d. O_2 Which clement tends to lose electrons in a chemical reaction? a. Cl b. Mg c. O d. S In a chemical reaction between calcium and chlorine atoms, chlorine atoms tend to be a. oxidized. b. reduced. Select the incorrect association. a. covalent bond-electrons transferred b. hydrogen bond-between water molecules c. ionic bond-charged particles formed d. polar covalent bond-present in the water molecule Which element tends to be reduced in a chemical reaction? a. Ca b. Cl c. K d. Mg Each is a property of water EXCEPT a. easily changed from liquid to gas. b. good solvent. c. maximum density at 4 degree C. d. molecules are cohesive.

Solution

1.The correct answer is:b.12

Reason: Atomic mass = number of protons + number of neutrons

Number of neutrons = Atomic mass - number of protons

= 23 - 11 ( since atomic number is 11) = 12 ans.

2.The correct answer is:a.1

Reason: Atomic number is the number of protons present on the nucleus of atom.

3.The correct answer is:a.6

Reason:Number of protons = Number of electrons=6

4.The correct answer is:c.isotopes

Reason: The above relationship of carbon depicts isotopes.

5.The correct answer is:d.23

Reason: Atomic weight = number of protons+ number of neutrons = 11+ 12 = 13(number of electrons= number of protons in neutral atom)

6.The correct answer is:less

Reason: K shell is the first and close to nucleus followed by L and M. Shell far from nucleus possess more energy i.e L.in this case.

7.The correct answer is:d.2-8-4

Reason: K shell will hold 2 , L shell will hold 8 and M shell will hold 4 electrons.

8.The correct answer is:d.8

Reason: L shell can hold 8 electrons.

9.The correct answer is:c.12

Reason: This element with 12 atomic number will have 2 free electrons in outer shell

10.The correct answer is:c.10

Reason: Atomic number 10 refers to Neon.

11.The correct answer is:c.NaCl

Reason.NaCl is a compouns made up of two elements Na and Cl.

12.The correct answer is:b.Mg

Reason:Magnesium loses electrons.

13.The correct answer is:b.reduced

Reason:Chlorine acts as oxidising agent and is reduced.

14.The correct answer is:a.covalent bond--electrons transferred

Reason: Covalent bond--sharing of electrons.

15.The correct answer is: b.Cl

Reason:Halogens can be reduced.

16.The correct answer is: a.easily changed from liquid to gas.

Reason: Water changes from liquid to gas at 100 ^oC.