Chemistry Unit 1

This topic is related to the development of the periodic table

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Why do alkali metals have to be stored in oil?

Answer: to stop them from reacting with the oxygen in the air

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What happens to the reactivity of Group 1 elements

Answer: it increases because the electron is more easily lost as the atom is bigger because of the increasing amount of energy levels of the atom. It is also less strongly attracted to the nucleus.

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What was Newland's idea?

Answe: the Law of Octaves

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3 reasons why Newland's idea was not accepted?

Answer: 1. he didn't leave any gaps for undiscovered elements

      2. he sometimes put 2 elements in one space

      3. every 8th element were not of similar properties

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What was the law of octaves?

Answer: the idea that every 8th element had similar properties

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What was Medeleev's idea?

Answer: to put the elements in order of their atomic masses

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Why was Mendeleev's idea accepted?

Answer: because the predictions he made about the undiscovered elements were correct

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How many electrons are in the outer shell of a Gro

Answer: 1

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What charge does a Group 1 alkali metal get when i

Answer: a single positive charge (e.g- Na+)

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How many electrons are in the outer shell of a Gro

Answer: 7

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What are halogens?

Answer: a group of poisonous non-metals which all have coloured vapours

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What happens to the reactivity of Group 7 halogens

Answer: it decreases as the outer shell gets further away from the nucleus so its less attracted. This means it is harder for the atom to attract the 8th electron needed to complete the outer energy level

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What happens when the halogens share electrons wit

Answer: they from covalent compounds

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What happens when the halogens ionically bond with

Answer: they gain a single electron to give them a stable arrangement of electrons. This gives them a charge of -1 (e.g Cl-)

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Explain the metallic structure of a transition met

Answer: the metal's atoms exist in a giant structure help together by metallic bonds, and the outer electrons of each atom can move about freely with the metal. (delocalised electrons)

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Are transition metals good conductors of heat or e

Answer: both

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Are the transition metals more reactive or less re

Answer: less reactive - this means they do not react as easily with oxygen or water as the alkali metals

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Comments

Hayley

This is good but it would have been nice if you had filled up each note card and explained..like i don't know what newlands idea is. So maybe a little more details? But good notecards all the same, ta hun

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