ATOMS
Q1. Describe an atom .
Ans. An atom is the smallest part of an element which can exist.
Everything around us is made up of tiny particles called atoms .
Examples :- Sun, Moon, table, book, the room . The smallest atom of
all is Hydrogen and the largest is Uranium.
Every atom contains a nucleus made up of protons and neutrons.
Electrons move around the nucleus in their shells.
Q2. What is an element?
Ans. An element is a substance that is made up of only one type of
atoms.
An element cannot be broken down into anything smaller.
So far 117 elements have been discovered.
Some elements are Carbon, Nitrogen , Iron and Gold.
Q3. What is the difference between a chemical symbol and a
chemical formula? Give examples of each.
Ans. A chemical symbol is a letter or a pair of letters which represent
an element. Some common symbols are H= Hydrogen, He= Helium N
=Nitrogen.
A chemical formula shows the number and kinds of atoms in a
molecule. Some examples are: Hydrogen gas which consists
of Hydrogen atoms linked together H². Carbondioxide consists of one
carbon atom and two Oxygen atoms. It has the formula CO2.
Q4. Describe the structure of an atom and draw a labelled diagram of
an atom.
Q1. Describe an atom .
Ans. An atom is the smallest part of an element which can exist.
Everything around us is made up of tiny particles called atoms .
Examples :- Sun, Moon, table, book, the room . The smallest atom of
all is Hydrogen and the largest is Uranium.
Every atom contains a nucleus made up of protons and neutrons.
Electrons move around the nucleus in their shells.
Q2. What is an element?
Ans. An element is a substance that is made up of only one type of
atoms.
An element cannot be broken down into anything smaller.
So far 117 elements have been discovered.
Some elements are Carbon, Nitrogen , Iron and Gold.
Q3. What is the difference between a chemical symbol and a
chemical formula? Give examples of each.
Ans. A chemical symbol is a letter or a pair of letters which represent
an element. Some common symbols are H= Hydrogen, He= Helium N
=Nitrogen.
A chemical formula shows the number and kinds of atoms in a
molecule. Some examples are: Hydrogen gas which consists
of Hydrogen atoms linked together H². Carbondioxide consists of one
carbon atom and two Oxygen atoms. It has the formula CO2.
Q4. Describe the structure of an atom and draw a labelled diagram of
an atom.
