Advertisements
Advertisements
प्रश्न
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose electron?
उत्तर
X
APPEARS IN
संबंधित प्रश्न
Write the names of `"FeS"` compounds :
Fill in the blank
An ion with negative charge is called _______
Define: Chemical bond
Define: Mass number
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Give two examples for each of ionic and covalent bond.
What does the word ‘atom’ mean?
How did Neils Bohr visualise the atom ?
Fill in the blank
An _______ is electrically neutral.
For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.
Which has more atoms, 50 g of aluminium or 50 g of iron ? Illustrate your answer with the help of calculations.
(Atomic masses : Al = 27 u ; Fe = 25 u)
Select the correct answer to the statement given below:
The smallest particle of a substance – capable of independent existence and which retains the characteristics of the substance.
Define the following term with an example.
Element
Define – Atom.
Name the sub-atomic particles.
Define the following term with an example.
Metalloid
The volume occupied by 1 mole of a diatomic gas at S.T.P is ______
A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?
Write any two observations which support the fact that atoms are divisible.
The first scientific theory about atoms was given by J J. Thomson.
