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WorksheetsStructure of atom
Total questions: 15
Worksheet time: 10mins
Who discovered the electron?
Rutherford
John Dalton
Thomson
Goldstein
Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in the discovery of
atomic mass
proton
electron
nucleus in the atom
Which of the following statement is always correct?
An atom has equal number of electrons and protons.
An atom has equal number of electrons and neutrons.
An atom has equal number of protons and neutrons.
An atom has equal number of electrons, protons and neutrons.
What is the atomic number of aluminium ? Write its electronic Configuration and find out it's valency?
What is the symbol of manganese?
Mg
M
Ma
Mn
What are valence electrons?
electrons on the first orbital always
nucleus
the number of electrons on the outermost orbital
the outermost shell
Carbon atomic number is 6. This means that an carbon atom must have
6 electrons
6 protons
6 electrons and protons
6 neutrons
99.9% of the atom's mass is located in the
electrons
nucleus
protons
neutrons
Dalton proved that the true nature of the atom could best be described as resembling "plum pudding."
True
False
What types of particles are found in the cloud surrounding the atom's nucleus?
Positively charged particles and negatively charged particles
Negatively charged particles only
Neutral particles and positively charged particles
Positively charged particles only
2 elements X & Y combines to form a compound XY. The same compound is obtained from different experiment. give the law in accordance to above observation
law of conservation of mass
law of multiple proportion
law of constant proportion
Law of constant proportion is also referred to as law of definite proportion
True
False
In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?
4g
5g
9g
14g
If 100 grams of calcium carbonate(whether in the form of marble or chalk) are decomposed completely, then 56 grams of calcium oxide and 44 grams of carbon dioxide are obtained'. Which law of chemical combination is illustrated by this statement?
Give one major drawback of Dalton's atomic theory of matter.
