Advertisements
Advertisements
प्रश्न
Fill in the blank:
Atoms are _____
Advertisements
उत्तर
Atoms are neutral.
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?
TRUE \ FALSE
Cathode rays are a stream of fast moving particles that travel in random directions.
Write the names of the elements present in the following compound.
Common salt
Write the names of `"Na"_3"PO"_4` compounds :
Define: Ions
Define: Relative atomic mass
An atom has 13 protons and 14 neutrons.
How many electrons would be present in this atom ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X?
Fill in the blank
An excess of electrons produces a ________ charge.
How is the size of an atom indicated ?
Define the following term:
Atom
Electron, proton, neutron are the types of ______ in an atom.
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.
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of phosphorus
Rewrite the given sentence in correct form.
Elements contain two or more kind of atoms and compounds contain only one kind of atom.
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
1 mole of Gold and Silver contain same number of atoms.
Lead is also known as plumbum.
The first scientific theory about atoms was given by J J. Thomson.
