Question 1
Question
In the 19th century, did scientists know the structure of atoms?
Question 2
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In 1863, Newlands proposed his...
Answer
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Law of octaves
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Theory of evolution
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Law of structures
Question 3
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What did the law of octaves state?
Question 4
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Why was Mendeleev's periodic table better than Newlands?
Answer
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He left gaps for undiscovered elements
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He discovered the missing elements
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He discovered the structure of an atom
Question 5
Question
Elements are arranged in the periodic table in order of their atomic numbers
Question 6
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Why do elements in the same group have similar chemical properties?
Question 7
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When metals react they lose electrons so...
Question 8
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When non-metals react they gain electrons so the reactivity of non-metals decreases going down the group
Question 9
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Group 1 elements are called the...
Answer
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Acid metals
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Alkali metals
Question 10
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They react readily with...
Question 11
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Alkali metals have low melting and boiling points that decrease going down the group
Question 12
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Alkali metals react with water to produce hydrogen gas and...
Question 13
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Group 1 metals form ionic compounds in reactions
Question 14
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Why does reactivity increase going down group 1?
Answer
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The outer electron is less strongly attracted to the nucleus as the number of shells increase and the atoms get larger
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The outer electron is more strongly attracted to the nucleus as the number of shells increase and the atoms get larger
Question 15
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Transistion elements are...
Question 16
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Do transition elements react slowly or quickly with oxygen and water?
Question 17
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Are transition elements useful as building materials?
Question 18
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Compounds of transition elements are...
Answer
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Dull colours
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Brightly coloured
Question 19
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Transition elements form positive ions
Question 20
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Which group are the halogens?
Question 21
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Fill in the gap: Fluorine is a ........................................... at room temperature
Answer
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Pale yellow gas
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Yellow solid
Question 22
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Chlorine is a green gas at room temperature
Question 23
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Bromine is a green liquid at room temperature
Question 24
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Iodine is a grey solid at room temperature that easily vapourises to a violet gas
Question 25
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How do halogens bond with metals and non-metals?
Question 26
Question
Why does the reactivity of the halogens decrease going down group 7?
Answer
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The attraction of the outer electrons to the nucleus increases as the number of occupied shells increase
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The attraction of the outer electrons to the nucleus decreases as the number of occupied shells increase