Advertisements
Advertisements
प्रश्न
K: Potassium:: C: ______.
Advertisements
उत्तर
K: Potassium:: C: Carbon.
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?
WRITE SHORT ANSWER
Define an ionic compound.
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
Define: Mass number
Name the particle or particles you would expect to find in :
The orbit of an atom
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
Does the particle have an excess of electrons or a deficiency of electrons ?
Fill in the blank
A charged particle is called an _____
Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.
Define the following term:
Atom
Electron, proton, neutron are the types of ______ in an atom.
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
Define the following term with an example.
Compound
1 mole of Gold and Silver contain same number of atoms.
Does the solubility of a substance change with temperature? Explain with the help of an example.
Write any two observations which support the fact that atoms are divisible.
The graphite refill used is pencil is made of element called ______.
An atom of Oxygen (O) and two atoms of hydrogen (H.) combine to form a molecule of ______.
Lead is also known as plumbum.
The first scientific theory about atoms was given by J J. Thomson.
