Advertisements
Advertisements
प्रश्न
Define the following term with an example.
Compound
Advertisements
उत्तर
Compound: A compound is a pure substance that is formed when the atoms of two or more elements combine chemically in definite proportions.
Ex: H20, NaCl.
APPEARS IN
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?
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Write the names of the elements present in the following compound.
Common salt
Fill in the blank
An ion with positive charge is called ______
What does an atom consist of ? Explain.
Name two particles found inside the nucleus. What are they collectively called ?
Fill in the blank
An _______ is electrically neutral.
Fill in the blank
A deficiency of electrons produces a ________ charge.
Write the relation between nanometre and metre.
What is an atom ? How do atoms usually exist ?
Compare:
Chlorine atom and chloride ion, with respect to
Atomic structure
Electrical state
Draw the diagrams representing the atomic structures of the following: Neon
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will gain electron?
A radical take part – unsplit in a chemical reaction and retains its identity in reactions.
With reference to the radical –
- ammonium
- bisulphate
- carbonate
state the group of atoms present in each radical.
The smallest particle of matter that can exist by itself is ______.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
An atom of an element has no electron. Will that atom have any mass or not? Can an atom exist without electron? If so then give example.
An element is composed of ______ atoms.
In the nucleus of `""_20"Ca"^40`, there are ______
What are the 3 most abundant atoms on the earth?
