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प्रश्न
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form negative ion?
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उत्तर
Y
APPEARS IN
संबंधित प्रश्न
Name two particles found inside the nucleus. What are they collectively called ?
Define: Covalent bond
Who originated the word ‘atom’ ?
State Dalton’s atomic theory.
How did Neils Bohr visualise the atom ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the atomic numebr of X ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the charge on the particle ?
Fill in the blank
If an atom gains an electron, it is called an _______
Fill in the blank
A deficiency of electrons produces a ________ charge.
Write the relation between nanometre and metre.
What value has been given to the mass of this reference atom ?
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Draw the basic structure of an atom representing its –
- Subatomic particles
- Nucleus
- Orbits or shells.
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.
In all atoms of an element
Which of the following has maximum number of atoms?
The most abundant type of atom is the universe is ______.
The ______ are combination of atoms of various elements or the same element.
The first scientific theory about atoms was given by J J. Thomson.
