The basic unit of matter is________.
The sub atomic particle revolve around the nucleus is
______is positively charged.
Which of the following scientists observed that cathode rays consist of negatively charged particles?
The smallest particles found in the atom are called
The nucleus has _____and _________.
Assertion(A): An atom is electrically neutral.
Reason(R): Atom have equal number of protons and electrons.
Nucleon comprise ______.
Size of an atom is_______.
Diameter of dust particle is ________.
John Dalton proposed at atomic theory in the year
______is the smallest unit used to measure small lengths.
1 nanometer is equal to_______.
Thomson proposed atomic theory in the year
Thomson compared an atom to a
Thomson compared watermelon seed as charged part
The atomic particle discovered by Thomson
Diameter of pencil is_________.
Diameter of virus is________.
Diameter of red blood cell is
Thomson`s greatest discovery was awarded by the _______
_____Is made up of 2 or more atoms.
Whose theory does not propose anything about the positive and negative charges of an atom
The average diameter of an atom is
1 m is equal to______ mm
Who discover the existence of the natively charged particle is an atom
J.J. Thomson`s model is also called as_________.
Proton and neutron are called_______.
Proton was discovered by____________.
________ are the combination of atom of various elements or the same element
According to John Dalton, atom is a hard-solid ball and it is ________.
Around ______atoms in our body
The total negative charge of all the electrons outside the nucleus is equal to the total number of _____ in the nucleus
Who discovered electron?
Who discovered neutron?
The mass of electron is______.
The mass of proton is _________.
The mass of neutron is _________.
The structure of an atom is same as the structure of the________.
The number of electrons or protons in an atom is called the ____ of that atom
Atomic number represented by the letter
Letter A represented the
If the atomic number of carbon is 6 what is the number of electrons revolving in its Orbit?
Lithium atom contains 3 protons and 4 neutrons. Its mass number A is
Sulphur atom contains 16 protons and 16 neutrons. Calculate its atomic number and mass number.
Assertion(A): The mass of an atom is the mass of nucleus. .
Reason(R): The nucleus is at the centre.
Assertion(A): The number of protons and neutrons is the atomic number.
Reason(R): The mass number is the sum of protons and neutrons.
Choose the wrong pair.
Find the incorrect Pair.
Choose the wrong one with their valency.
John Dalton proposed the atomic theory in the year
Choose the incorrect statement.
Hydrogen has __________isotopes
Find the odd one out.
Choose the incorrect one.
Sun : Nucleus :: Planets :_____
Atoms that have the same mass number but different atomic number are called_______.
Atoms that have same atomic number but different Mass number are called
The unit used to measure the size of atoms and molecules is
Choose the correct symbol.
