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All questions of Structure and properties of materials for Class 8 Exam
The atomic number of an element is determined by the number of:- a)Neutrons in the nucleus
- b)Protons in the nucleus
- c)Electrons orbiting the nucleus
- d)Both protons and neutrons
Correct answer is option 'B'. Can you explain this answer?
The atomic number of an element is determined by the number of:
a)
Neutrons in the nucleus
b)
Protons in the nucleus
c)
Electrons orbiting the nucleus
d)
Both protons and neutrons
 | Subset Academy answered |
The atomic number of an element represents the number of protons found in the nucleus of its atoms. It determines the element's identity and its position in the periodic table.
The smallest part of an element that retains the identity (and the chemical properties) of that element is ...- a)A chemical
- b)A molecule
- c)An atom
- d)An electron
Correct answer is option 'C'. Can you explain this answer?
a)
A chemical
b)
A molecule
c)
An atom
d)
An electron
 | Nidhi Bhatt answered |
The idea of atoms has been around for thousands of years but it was only during the last two hundred years that scientists have found evidence they exist. In 1981, a very powerful microscope was developed that can be used to 'see' actual atoms
Which elements are in SO2?- a)Sodium and oxygen
- b)Strontium and oxygen
- c)Sulfur and oxygen
- d)Tin and oxygen
Correct answer is option 'C'. Can you explain this answer?
Which elements are in SO2?
a)
Sodium and oxygen
b)
Strontium and oxygen
c)
Sulfur and oxygen
d)
Tin and oxygen
 | Coders Trust answered |
If you did not know the answer, you could easily have looked up the chemical symbols to find out what elements they represent
What is the correct formula for H-H?- a)2H
- b)H1H1
- c)H2
- d)H22
Correct answer is option 'C'. Can you explain this answer?
What is the correct formula for H-H?
a)
2H
b)
H1H1
c)
H2
d)
H22
 | Tutorpedia Coaching answered |
This is a simple representation of a molecule of the element hydrogen. You know that it is an element because there is only one type of atom in the formula
How many atoms of sulfur are there in CuSO4?- a)Four
- b)One
- c)Three
- d)Two
Correct answer is option 'B'. Can you explain this answer?
How many atoms of sulfur are there in CuSO4?
a)
Four
b)
One
c)
Three
d)
Two
 | Focus Academy answered |
There is no small number after the chemical symbol for sulfur therefore there is only one atom
Which subatomic particle is responsible for the positive charge of an atom's nucleus?- a)Proton
- b)Neutron
- c)Electron
- d)Photon
Correct answer is option 'A'. Can you explain this answer?
Which subatomic particle is responsible for the positive charge of an atom's nucleus?
a)
Proton
b)
Neutron
c)
Electron
d)
Photon
 | Eduskill Classes answered |
Protons are positively charged particles found in the nucleus of an atom. They determine the atomic number of an element and contribute to its overall positive charge.
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