YSICAL SCIENCE Examination 7-Continued udent\'s Name AUBREY SCOt Student Number

Question

YSICAL SCIENCE Examination 7-Continued udent's Name AUBREY SCOt Student Number Il1 A150 9. Below is the electron-dot structure for beryllium (bear-rill-lee-um: Number I1 41s0 A. How many nonbonding pairs of electrons does beryllium have? B. How many unpaired electrons does beryllium have? C. The maximum number of electrons that can be held in the valence shell of beryllium is 8. Would bery'llium be more likely to lose or gain electrons in a chemical reaction? Based on your answer to chemical formula? C, if beryllium formed an ion, what would be its D. E. Look at Figure 23.6 at the bottom of page 392 in your textbook. With which of the following elements would beryllium most likely form an ionic bond? (circle one) Na Ca Fe Br For each of the following, write on the blank line the letter of the word or phrase that best completes the statement or answers the question. When two atoms come in contact, both of which tend to gain electrons, what type of bond is formed? (A) ionic (B) covalent (C) nonbonding (D) unpaired 30. When the atoms in a molecule share two electrons, these electrons are called (A) a noabonding pair (B) unpaired electrons (C) a bonding pair (D) an ion. 31 (over) 209

Explanation / Answer

Solution :-

Q29 A) Be have 1 non bonding pair of electrons

B) Electronic configuration of the Be is 1s2 2s2

So it do not have any unpaired electrons

So number of unpaired electrons in Be = 0

C) Berium is the metal and it have 2 electrons in its outer orbital so it need 6 more electrons to complete its octet therefore gaining 6 more electrons is difficult than losing 2 electrons therefore Be looses 2 electrons.

D) Since Be can loose 2 electrons therefore the ion formed is the Be^2+ ion because after losing the electrons positive ion is formed

E) F and Br are both non metals therefore Be can form bonds with F anf Br because F and Br can form the negative ions by gaining the electrons from the Be

Q30)

When both element tends to gain electrons means both elements are non metals and the bond formed between the non metal elements is the covalent bond

So the answer is option (B) = Covalent bond

Q31) When the 2 electrons are shared then it is called a bonding pair of electron

Therefore the answer is option (C) a bonding pair.

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