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9th_Ch_2_1_Early Atomic Theory-Isotopes and Average Atomic Mass

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Created on December 27, 2022

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Transcript

Early Atomic TheoryIsotopes and Average Atomic Mass

play

MIsSion 01

MIsSIoN 02

MISsION 1

Answer the questions about Early Atomic Theory correctly and discover the secret formula to become a scientist

start

He discovered in his gold foil experiment, that the nucleus is positively charged, small, and dense.

Ernest Rutherford
Jhon Dalton
Democrates

Which scientist used the oil drop experiment to measure the charge of individual electrons?

Erwin Schrodinger
Jhon Dalton
Robert Millikan's

3. Which of the following was the instrument used for the discovery of the electron?

Cathode ray tube
Gold foil experiment
Alpha particle emitter

Who first coined the term atom, meaning indivisible?

Democrates
Ernest Rutherford
Aristoteles

5. Why did Democritus disagree with Aristotle?

Democritus thought all matter was made of atoms, but Aristotle thought that only solids were made of atoms.
Aristotle thought all matter was made of atoms, but Democritus thought that only solids were made of atoms.
Aristotle thought matter could be divided infinitely, but Democritus thought there were tiny, indivisible particles.

GO...

Well done! You got the first part of the formula: H20+

MISsioN 02

Answer the questions about Isotopes and Average Atomic Mass correctly and discover the secret formula to become a scientist

empezar

Magnesium has three common isotopes. Based on its average atomic mass, which is the most common?

Mg

12

24.31

Magnesium-12
Magnesium-25
Magnesium-24

How many neutrons does the most common isotope of hydrogen have?

X and Y are elements that are isotopes to each other. Which of the following is true about X and Y?

They have different numbers of neutrons.
They have different numbers of protons.
They will have different numbers of electrons.

The average atomic mass or atomic weight found on the periodic table is _____.

a weighted average based on the abundances of all naturally occurring isotopes of an element
the number of protons, neutrons, and electrons of an element
the weight of the most common isotope of an element

How are isotopes of the same element similar?

They are equally abundant in nature.
They have the same number of protons.
They have the same mass.

GO...

Well done! You got the second part of the formula: Co2

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