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Vishwa
Subject: Science
, asked on 28/3/18
What is atomic and diatomic
Answer
1
Vaishnavi G
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
Answer
2
Sneha Roychowdhury
Subject: Science
, asked on 7/3/18
Please answer to Q16 a and b
Answer
2
Bhavya Biswas
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.
Answer
2
Bhavya Biswas
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.
Answer
1
Darshita Gupta
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.
Answer
3
Theodore Delacroix
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.
Answer
2
Harshit Singh Avengers
Subject: Science
, asked on 26/2/18
Describe Thomson's model of atom ?
Answer
1
Akanksha Prasad
Subject: Science
, asked on 25/2/18
how to learn chemistry class 9
Answer
2
Akanksha Prasad
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
Answer
1
Theodore Delacroix
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
Answer
5
Theodore Delacroix
Subject: Science
, asked on 24/2/18
Solve let's ponder both the q don't give copy paste nothing is similar
Answer
3
Noufiya
Subject: Science
, asked on 23/2/18
Solve this:
Write the symbols of (i) Lead (ii) Boron
Answer
1
Noufiya
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++, NH
4
+. Al+++
7. What were the conclusions of Rutherford's
α
-particle scattering experiment.
8. Calculate the molar mass of the following substance and identify the polyatomic ions present in each of them.
(a) Al
2
(SO
4
)
3
(b) CaCO
3
[Given that atomic mass of Al=27 u, S=32 u, O=16 i. Ca=40 u.
Answer
1
Hisham Hafeez
Subject: Science
, asked on 22/2/18
Please Answer all the questions, Experts
1) 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.
Answer
2
1
2
3
4
5
Next
What are you looking for?
* what is its atomic number and name the atom?
*what is the change in ion?
no links please and answer fast
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.
Pls.. fast tomorrow is my exam.
Write the symbols of (i) Lead (ii) Boron
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 -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.
1) 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.