La estructura de los átomos

La estructura de los átomos

Assessment

Interactive Video

Science, Chemistry, Physics

4th - 9th Grade

Hard

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The video discusses the evolution of the periodic table, highlighting Mendeleev's initial arrangement by atomic mass and Mosley's later adjustment to organize elements by atomic number. This change clarified the natural order of elements, linking atomic structure to chemical behavior. The video explains how electron shells determine element properties and reactivity, with each period corresponding to a filled electron shell. It also covers the trends in reactivity across groups, emphasizing the role of outer electrons. The final arrangement of elements validates Mendeleev's work, showing a true natural order in chemistry.

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5 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Who proposed the arrangement of elements by atomic number instead of atomic mass?

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