# chemistry help

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#1
using the periodic table, how can i figure out how many shells and electrons it has in that outer shell? I cant remember it and i dont know what to google, thanks. what i mean is that the period and group represents something
0
2 years ago
#2
(Original post by Gent2324)
using the periodic table, how can i figure out how many shells and electrons it has in that outer shell? I cant remember it and i dont know what to google, thanks. what i mean is that the period and group represents something
At a GCSE level,
Group = Number of electrons in outer shell
Period = Number of shells
1
2 years ago
#3
What about the ions an element has? How do I find that out?
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2 years ago
#4
(Original post by Gent2324)
using the periodic table, how can i figure out how many shells and electrons it has in that outer shell? I cant remember it and i dont know what to google, thanks. what i mean is that the period and group represents something
Group number = number of electrons on outer shell
Period number = number of shells an atom has
1
#5
(Original post by have)
At a GCSE level,
Group = Number of electrons in outer shell
Period = Number of shells
(Original post by lmaooome)
Group number = number of electrons on outer shell
Period number = number of shells an atom has
great thanks, is there an easy way i can find out if a metal is more / less reactive than hydrogen? (electrolysis)
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2 years ago
#6
(Original post by Gent2324)
great thanks, is there an easy way i can find out if a metal is more / less reactive than hydrogen? (electrolysis)
look in the data booklet

If it's not given, you should really just remember the specific cases you need to know.
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#7
(Original post by have)
look in the data booklet

If it's not given, you should really just remember the specific cases you need to know.
what do you mean by data booklet? (gcse)
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2 years ago
#8
(Original post by Gent2324)
what do you mean by data booklet? (gcse)
When I took my GCSE, it was given on the other side of the periodic table.

In your GCSE, it's probably not given. So you just learn the basic cases. Like hydrolysis of brine water makes Chlorine and Hydrogen etc.
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2 years ago
#9
(Original post by HEPTAKE)
What about the ions an element has? How do I find that out?
Metals form positive ions (cations) and lose the electrons on their outer shell
Non metals form negative ions (anions) and gain electrons so they have a full outer shell
Noble gases have a full outer shell already

The metals in group 1 lose 1 electron. Lithium ---> Li+
The metals in group 2 lose 2 electrons. Magnesium ---> Mg2+
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#10
(Original post by Iwannabesmart)
Metals form positive ions (cations) and lose the electrons on their outer shell
Non metals form negative ions (anions) and gain electrons so they have a full outer shell
Noble gases have a full outer shell already

The metals in group 1 lose 1 electron. Lithium ---> Li+
The metals in group 2 lose 2 electrons. Magnesium ---> Mg2+
what about all the transition metals? what group is that classed as?
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2 years ago
#11
(Original post by Gent2324)
what about all the transition metals? what group is that classed as?
They form cations as well
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