Subject: Science, asked on 28/3/18

## What is atomic and diatomic

Subject: Science, asked on 16/3/18

## if the number of electron is 8. Find * what is its atomic number and name the atom? ​*what is the change in ion? no links please and answer fast

Subject: Science, asked on 7/3/18

## Please answer to Q16 a and b

Subject: Science, asked on 5/3/18

## Meritnation experts please help me. I am unable to understand chapter three and four of science Please give me some easy notes or important questions out of them. Please tomorrow is my exam.

Subject: Science, asked on 5/3/18

## Meritnation experts pls.. give me a mnemonic to learn na!es of elements serial wise Pls.. fast tomorrow is my exam.

Subject: Science, asked on 2/3/18

## Hello good evening sir i am in fear because i think that i will fail in this class as because i was also fail in first term as well as in mock tests please i am in a great fear pls help me.

Subject: Science, asked on 1/3/18

## Q.11. Elements X, Y and Z have atomic no. 13, 18 and 17 respectively. Which one will form a cation? Identify the inert gas among them.

Subject: Science, asked on 26/2/18

## Describe Thomson's model of atom ?

Subject: Science, asked on 25/2/18

## how to learn chemistry class 9

Subject: Science, asked on 25/2/18

## how to develop interest while memorising points because when i learn half of chapter i feel very exhausted

Subject: Science, asked on 24/2/18

## PL give ans to vbq 3 this is the first of of q next page in the reply. PL don't give copy paste ans

Subject: Science, asked on 24/2/18

## Solve let's ponder both the q don't give copy paste nothing is similar

Subject: Science, asked on 23/2/18

## Solve this: Write the symbols of  (i) Lead (ii) Boron

Subject: Science, asked on 23/2/18

## These 3 questions, plz??: 6. Define valency. Classify the following cations on the basis of their valences : Ca++,Cu++, NH4+. Al+++ 7. What were the conclusions of Rutherford's $\alpha$-particle scattering experiment. 8. Calculate the molar mass of the following substance and identify the polyatomic ions present in each of them.  (a) Al2(SO4)3            (b) CaCO3 [Given that atomic mass of Al=27 u, S=32 u, O=16  i. Ca=40  u.

Subject: Science, asked on 22/2/18

## Please Answer all the questions, Experts1) a. Give reason for the following:(i) Isotopes of an element are chemically similar.(ii) Noble gases show least reactivity.     b. If K and L shells of an atom are full, then what would be the total number of electrons in the atom ? what is the valency of this element ?     c. write the electronic configuration of an element with atomic number 13 and represent it in terms of Bohr's model of atom.

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