Advertisements
Advertisements
प्रश्न
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
Advertisements
उत्तर
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
APPEARS IN
संबंधित प्रश्न
WRITE SHORT ANSWER
Define an ionic compound.
ANSWER IN DETAIL
How are isobars different from isotopes ?
Define:- Radicals
Write the names of the elements present in the:-
Ammonia
Write the names of `"FeS"` compounds :
Define: Relative atomic mass
Define: Covalent bond
Name the particle or particles you would expect to find in :
The nucleus of an atom
An atom has 13 protons and 14 neutrons.
What is the atomic number of the atom ?
An atom has 13 protons and 14 neutrons.
How many electrons would be present in this atom ?
Fill in the blank
An excess of electrons produces a ________ charge.
How is the size of an atom indicated ?
An atom of element E contains 3 protons, 3 electrons and 4 neutrons :
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element X be?
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
Compare:
Chlorine atom and chloride ion, with respect to
Atomic structure
Electrical state
Rewrite the given sentence in correct form.
Elements contain two or more kind of atoms and compounds contain only one kind of atom.
K: Potassium:: C: ______.
Define the following term with an example.
Metal
An element is composed of ______ atoms.
The volume occupied by 4.4 g of CO2 at S.T.P ______
The volume occupied by 1 mole of a diatomic gas at S.T.P is ______
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
Atoms of different elements having the same number of ______ are called isotones.
A change in the physical state can be brought about
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
Dalton’s atomic theory successfully explained
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportions
The graphite refill used is pencil is made of element called ______.
Lead is also known as plumbum.
The first scientific theory about atoms was given by J J. Thomson.
