Prep 2 - Science - Prepared by Mr. ASHRAF MOSA MOHAMED
Authored by ashraf mosa
Science, Chemistry
8th Grade
Used 13+ times
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51 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Elements are arranged ascending according to their atomic weights in ............
Modern periodic table
Mendeleev’s periodic table
Moseley’s periodic table
2.
FILL IN THE BLANKS QUESTION
1 min • 1 pt
Complete :
The number of known elements until now are (a) elements
3.
FILL IN THE BLANKS QUESTION
1 min • 1 pt
Complete :
The number of elements are abundant in the earth’s crust = (a)
4.
MULTIPLE SELECT QUESTION
2 mins • 1 pt
Advantages of Mendeleev’s table
Mendeleev predicted the ability of discovering new elements. So he left spaces in his table
He corrected the wrong estimated atomic weights of some elements
He had to make a disturbance in the ascending order of atomic weights for some elements, due to putting them in groups which suit their properties
He also would have to deal with the isotopes of one element as different elements because they are different in their atomic weights.
5.
MULTIPLE SELECT QUESTION
2 mins • 1 pt
Disadvantages of Mendeleev’s table
Mendeleev predicted the ability of discovering new elements. So he left spaces in his table
He corrected the wrong estimated atomic weights of some elements
He had to make a disturbance in the ascending order of atomic weights for some elements, due to putting them in groups which suit their properties
He also would have to deal with the isotopes of one element as different elements because they are different in their atomic weights.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
.................. discovered that the nucleus of atom contains positively charged protons
Moseley
Rutherford
Mendeleev
Bohr
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
............... discovered the main energy levels
Moseley
Rutherford
Mendeleev
Bohr
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