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Subject: Science, asked on 24/3/17

an atom has three shells and last shell has 4 electrons.what is its atomic number(answers by merit nation experts only please)​

Subject: Science, asked on 22/3/17

In the following table the mass number and the atomic number of certain elements are given:
 
Elements Mass No. Atomic No.
A 1 1
B 7 3
C 14 7
D 40 18
E 40 20
 
Making use of these data find 
(i) cation
(ii) anion
(iii) a pair of isotopes
(iv) an atom of noble gas


 

Subject: Science, asked on 22/3/17

plz tell these answee

Subject: Science, asked on 22/3/17

Solve Q 17 ii)

Subject: Science, asked on 21/3/17

Hydrogen exists in three isotopic forms . why are the isotopes of hydrogen chemically alike ?

Subject: Science, asked on 20/3/17

Electronic configration of al3+

Subject: Science, asked on 19/3/17

Chemical property of an element is determined by the atomic number or the atomic mass of an atom. Give reason

Subject: Science, asked on 18/3/17

we know that atomic number of an element is no of protons present. so what is the number of no of nucleons present in magnesium ion . plzzzz fast. i have exams 2moro. i want expert answer only.

Subject: Science, asked on 18/3/17

what is isotope and isobars ?write one example each .write the application of isotope .

Subject: Science, asked on 18/3/17

magnesium is an important constituent of chlorophyll 
a) calculate the no. of electron and neutron  present in atom of magnesium 
b)write its electronic configuration 
c)what is its valency ?

Subject: Science, asked on 18/3/17

if the atomic mass of a element is given, then how to determine the no. of neutrons present in it ?
pls. ans fast..!!!!!!

R J
Subject: Science, asked on 17/3/17

Hi guys,today i tell u how to accept friend request 1. Go to profile 2, see uper side 4 icons are present (i)friends,(ii)badges iii rank 2.now click on frieds there are many friend request are pending then click on accept

Subject: Science, asked on 17/3/17

5difference between anion and cation.....plzzz reply fast.

Subject: Science, asked on 16/3/17

Solve this:

Subject: Science, asked on 16/3/17

13th question

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