Advertisements
Advertisements
प्रश्न
Which of the following statement is correct about the atom of an element ?
पर्याय
an atom can have only protons and neutrons but no electrons.
an atom can have only electrons and neutrons but no protons
an atom can have only electron and proton but no neutron
an atom must always have a proton, neutron and electron
Advertisements
उत्तर
an atom can have only electron and proton but no neutron
An atom must have a proton and an electron, but it may not have a neutron.
For example, in hydrogen atom, there is 1 proton, 1 electron but no neutron.
APPEARS IN
संबंधित प्रश्न
If bromine atom is available in the form of, say, two isotopes `""_35^79Br (49.7%)" and """_35^81Br (50.3%)`, calculate the average atomic mass of bromine atom.
TRUE \ FALSE
Elements combine in definite proportions to form compounds.
WRITE SHORT ANSWER
What is radioactivity?
Write the names of the elements present in the:-
Sodium hydroxide
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Name three non-metals/radicals which have valency -1, -2, and -3.
What does the word ‘atom’ mean?
Fill in the blank
A charged particle is called an _____
Name the unit in which the radius of an atom is usually expressed.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form positive ion?
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of phosphorus
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
K: Potassium:: C: ______.
Define the following term with an example.
Compound
Define the following term with an example.
Non-metal
The volume occupied by 1 mole of a diatomic gas at S.T.P is ______
Write any two observations which support the fact that atoms are divisible.
What are the 3 most abundant atoms on the earth?
Atoms have a radius of the order ______.
A small block slides down on a smooth inclined plane, starting from rest at time t = 0. Let Sn be the distance travelled by the block in the interval t = n – 1 to t = n. Then, the ratio `S_n/(S_(n + 1))` is ______.
