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प्रश्न
Write the names of `"Ca"("NO"_3)_2` compounds :
उत्तर
`"Ca"("NO"_3)_2` - Calcium Nitrate
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संबंधित प्रश्न
The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes `""_8^16X" and """_8^18X` in the sample?
MATCH THE COLUMNAS
| 1. Jpham Dalton | a. Neutrons |
| 2. Atom | b. Model of the atom |
| 3. Chadwick | c.The atomic theory of matter |
| 4. Rutherfrod | d. Positively charged |
| 5. Protons | e. Electricity neutral |
| 6. Nuclear fusion | f. Generator of electricity |
| 7.Gamma -rays | g. High penetrating power |
| h.Energy in sun |
TRUE \ FALSE
Elements combine in definite proportions to form compounds.
Define:- Atom
Write the names of the elements present in the :-
Sulphuric acid
Write the names of the elements present in the:-
Acetic acid
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Name the particle or particles you would expect to find in :
The nucleus of an atom
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is such a particle called ?
Fill in the blank
If an atom loses an electron, it acquires ______ a charge.
Fill in the blank
An _______ is electrically neutral.
How many times is a proton heavier than an electron?
State two observations which show that atom is not indivisible.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
The basic unit of matter is ______.
State true or false. If false, correct the statement.
An atom is electrically neutral.
Define the following term with an example.
Metalloid
______ is the smallest particle of an element.
Which of the following has maximum number of atoms?
Lead is also known as plumbum.
