Advertisements
Advertisements
Question
Define – Atom.
Solution
An atom is the smallest particle of a chemical element that retains its chemical properties.
APPEARS IN
RELATED QUESTIONS
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
WRITE SHORT ANSWER
What is radioactivity?
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
Define:- Radicals
Write the names of `"Ca"("NO"_3)_2` compounds :
Name the particles which revolve around the nucleus.
What are orbits or shells ?
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
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 ?
Fill in the blank
An _______ is electrically neutral.
Write the full form of IUPAC.
What is an atom ? How do atoms usually exist ?
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Draw the electron dot structure of this compound.
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.
An atom is electrically neutral.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
Define the following term with an example.
Compound
In all atoms of an element
An element is composed of ______ atoms.
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
Atoms of one element can be transmuted into atoms of other elements by ______
Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order
- Rutherford’s atomic model
- Thomson’s atomic model
- Bohr’s atomic model
The smallest unit of an element is ______.
What is the fundamental particle of an element?
