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प्रश्न
An element is composed of ______ atoms.
उत्तर
An element is composed of same kind of atoms.
APPEARS IN
संबंधित प्रश्न
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
WRITE SHORT ANSWER
Name three inert gases.
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Define:- Atom
Define:- Radicals
Define: Ions
Define: Mass number
What does an atom consist of ? Explain.
An atom has 13 protons and 14 neutrons.
How many electrons would be present in this atom ?
Define: An Atom:
Name the three subatomic particles present in an atom.
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
In what respects do the three isotopes of hydrogen differ? Give their structures.
Draw diagrams representing the atomic structures of the following:
- Sodium atom
- Chlorine ion
- Carbon atom
- Oxygen ion
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose electron?
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of phosphorus
The smaller particles found in the atom is called ______.
Project.
To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.
The ______ are combination of atoms of various elements or the same element.
