Question

plzzzzzz answer this its urgent plzzz answer 6th question and 8th

Answer 1

hey here is ur answer.......
8th....in atomic no. 18
no. of electrons..... 18
distribution.... 2,8,8
electronic configuration... 1s2,2s2,2p6,3s2,3p6
6 is long

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Answer 2

Hey !!!!!

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6.(1) Atoms Combine to form Molecules : Lets Understand it, It means That 2 or more simple and free atoms combine to for a molecule. Ex. O+O = O2. O2 is a molecule Whereas, O is Element/Atom...

6.(2) Atoms are neutral : Atoms  Have to be Neutral as They cant carry charge, Where as, Molecules carry charge, Like O is Neither + or - Its Electrically Neutral... But, O2 is Negatively charged...

6.(3) Isotopes have similar chemical Properties : Yes, They do have, Because Isotopes are those with same chemical/ same elements, Since They are same elements, They have same properties..

6.(4) Nucleus Are + charge : Since, An Atom is Electrically Neutral, Its having Electrons with - charge, Hence to balance it and make atom neutral, There Nucleus is + charged....



8. Since The Atomic Number is 18, Total Electrons is 18...

Now, Distribution : 2,8,8   ... Since, 1st shell cant have more than 2 e-

Hence, distribution is 2,8,8.... Means The Atom is Inert gas named Argon....

Hence, Gas is Argon and distribution is 2,8,8



9. AlCl3 is formed Now, According to criss-cross method, 

We Know That, Cl valency is 1

Hence, Al Valency is 3

Hence, The Valency of Aluminium is 3

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Hope This Helps.....!!!!