Who proposed the arrangement of elements by atomic number instead of atomic mass?
La estructura de los átomos

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Science, Chemistry, Physics
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4th - 9th Grade
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Niels Bohr
Henry Mosley
Dmitri Mendeleev
John Dalton
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What defines each element according to the modern periodic table?
Number of neutrons
Number of electrons
Atomic mass
Number of protons
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many electrons can the second electron shell hold?
6
4
8
2
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the key factor that determines the similarities and reactivity of elements in the same column?
Number of protons
Number of outer electrons
Atomic mass
Number of neutrons
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which group of elements is known for having only one outer electron, making them highly reactive?
Group 7
Group 6
Group 2
Group 1
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