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Question
Complete the following table relating to the atomic structure of some elements.
|
Element Symbol |
Atomic Number |
Mass Number |
Numbers of neutrons |
Number of Electrons |
Number of Protons |
|
Li |
3 |
6 |
|
|
|
|
Cl |
17 |
|
20 |
|
|
|
Na |
|
|
12 |
|
11 |
|
Al |
|
27 |
|
|
13 |
|
S |
|
32 |
16 |
|
|
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Solution
|
Element Symbol |
Atomic Number |
Mass Number |
Numbers of Neutrons |
Number of Electrons |
Number of Protons |
|
Li |
3 |
6 |
4 |
3 |
3 |
|
Cl |
17 |
37 |
20 |
17 |
17 |
|
Na |
11 |
23 |
12 |
11 |
11 |
|
Al |
13 |
27 |
14 |
13 |
13 |
|
S |
16 |
32 |
16 |
16 |
16 |
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RELATED QUESTIONS
Five atoms are labelled from A to E.
| Atoms | Mass No. | Atomic No. |
| A | 40 | 20 |
| B | 19 | 9 |
| C | 7 | 3 |
| D | 16 | 8 |
| E | 14 | 7 |
(a) Which one of these atoms:
(i) contains 7 protons,
(ii) has an electronic configuration 2, 7?
(b) Write down the formula of the compound formed between C and D.
(c) predict which are: (i) metals, (ii) non-metals?
Give electron dot diagram of the following:
methane
The following table shows the electronic configuration of the elements W, X, Y, Z:
|
Element |
W |
X |
Y |
Z |
|
Electronic |
2, 8, 1 |
2, 8, 7 |
2, 5 |
1 |
Answer the following question based on the table above:
What is the formula of the compound formed between W and X.
What is an α (alpha) particle?
How do atoms attain noble gas configurations?
Write the formula of its (X)
sulphate
nitrate
phosphate
carbonate
hydroxide.
Match the following:
| 1. | Atomic bond | a. | Oxygen and hydrogen |
| 2. | Atoms with different electronegativities | b. | acceptor bond |
| 3. | An atom that accepts electron pair | c. | covalent bond |
| 4. | Rusting of iron | d. | donor atom |
| 5. | An atom that provides electron pair | e. | oxidation |
| f. | ionic bond |
What is meant by a chemical bond?
How many atoms of each kind are present in the following molecule:
Chlorine
Elements A, B and C have atomic number 17, 19 and 10 respectively.
State which one is chemically inert.
