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What is the main characteristic of the last element in each period of the periodic table?
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Mention the basic tendency of an atom which makes it to combine with other atoms.
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Fill in the blank:
The horizontal rows in the periodic table are called _____________.
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An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
What will be the formula of its phosphate?
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Elements A, B and C have atomic number 17, 19 and 10 respectively.
State which one is a non-metal.
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An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
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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?
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The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
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The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
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Match the atomic number 4, 8, 14, 15 and 19 with each of the following:
(a) A solid non-metal of valelncy 3.
(b) A gas of valency 2.
(c) A metal of valency 1.
(d) A non-metal of valency 4
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Elements X, Y, and Z have atomic numbers 6, 9 and 12 respectively. Which one forms an anion?
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Give electron dot diagram of the following:
Magnesium chloride
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Give electron dot diagram of the following:
nitrogen
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Give electron dot diagram of the following:
methane
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(i) How many atoms of each kind are present in the following molecules: calcium oxide, chlorine, water, carbon tetrachloride?
(ii) How many electrons are required for their octet structure?
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Complete the following:
| Sodium | Phosphorus | Carbon | |
| Formula of chloride | |||
| Nature of bonding | |||
| Physical state of chloride |
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Name an alkali metal in period 3 and halogen in period 2.
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Name the noble gas with 3 shells.
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Write the probable colour of the following salt:
Ferrous salts
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Write the probable colour of the following salt:
Ammonium salts
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