# data[].attributes.body
Protons.    1.   Add 1
Neutrons  1. Zero
Electrons. 1/1840.   Subtract 1

# data[].attributes.body
-------Key-------
Proton  (atomic) number
Atomic symbol
Relative atomic mass
Example :
2 (proton atomic number)
He (atomic symbol)
helium (name)
4 (relative atomic mass)
(Neutrons + Protons)
Electrons no.= Protons no.
(In atoms) ^
Atomic no. always smaller than mass

# data[].attributes.body
Isotopes have the same number of protons but different number of neutrons

# data[].attributes.body
If any two elements have different number of protons,they are not the same.

# data[].attributes.body
Atoms always have an equal number of protons and electrons they like to be stable.

# data[].attributes.body
1. Electrons are outside the nucleus. We can draw atoms like this: Atoms are drawn by writing the element symbol, then it is surrounded by circles. The first has two electrons, the second has up to eight and the third can have up to eight also, the forth shell can carry up to 18(carries ... Electrons are indicated by drawing crosses or dots on the circles to indicate them.

# data[].attributes.body
Use key instead of legend. Remember to put it in exams!

# data[].attributes.body
1 means group no 1 (first column from left) all have 1 electrons on their outer shell and so on.......
Every horizontal from the TOP has a different no of shells so the TOP row has elements which have only one shell...Second has two shells and so on....

# data[].attributes.body
The elements in the middle are not in a column have no specific charge while the side columns have a charge

# data[].attributes.body
First shell,2. Second shell,8. Third shell,8. Fourth shell, 18.

# data[].attributes.headline
Group 0 Elements(Noble Gases(unreactive or inert))

# data[].attributes.subject
Group 0 Elements(Noble Gases(unreactive or inert))

# data[].attributes.body
Group 0 because the atoms here do not always have 8 outer(valence) electrons

# data[].attributes.headline
Question:What happens when sodium metal reacts with water?

# data[].attributes.subject
Question:What happens when sodium metal reacts with water?

# data[].attributes.body
Answer :There would be an explosion (Chemical Reaction)

# data[].attributes.body
(2,8,1) (As it has only one electron on the outside, it is very reactive.

# data[].attributes.body
Ions are charged atoms that has become a particular charge(positive or negative). Eg A sodium Atom becomes a positive ion if it loses an electron and becomes a negative if it gains an electron.

# data[].attributes.body
Writing ions are like this: Na+( This shows that the atom has lost one electron, becoming positive 1) Mg2+ Shows that the magnisium atom has lost two electrons thus has a +2 charge

# data[].attributes.body
When an atom gains or loses electrons, it will become an ion

# data[].attributes.headline
Electronic Configuration of a chlorine atom

# data[].attributes.subject
Electronic Configuration of a chlorine atom

# data[].attributes.body
For some elements like chlorine, it’s easier to gain an electron than to lose its entire shell so elements like chlorine can easily become negative ions or Cl-1

# data[].attributes.body
When an element has less than four electrons on its outer shell, it can easily become positive and vice versa