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Answers
Answer:
9)2 electrons in k shell
7 electrons in l shell.
atomic number=2+7=9
9th element is Florine
Explanation:
10) electron, proton and nuetron are called subatomic particles
electron. -ve
proton +ve
11)k shell- 2 electeons
l shell - 8 electrons
m shell - 18 electrons
n shell -32 electrons.
12)The model which was proposed by J J Thompson is called plum pudding or watermelon model.
Answers:-
10.Electrons(negatively charged particles),Protons(positively charged particles) and Neutrons(Neutral).
11.For getting maximum no. of electrons in a shell we use a formula of 2n².
Where n is the number of the shell.
E.g.K shell = 2n²=2 (1)²=2
L shell=8
M shell =18
N shell=32
12.Thompson's (J.J Thompson) atomic theory.
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