chapter 3 test review

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Chapter 3 Test Review

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Which of the following are ions and which are atoms?Ca2+

KRnO2-

Ions – Ca2+ O2-

Atoms – K Rn

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What are the different isotopes of hydrogen called?

Hydrogen, Dueterium, Tritium

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What are the different types of radiation and their symbols?

Alpha 4 He Beta 0 e-

Gamma 0 Y 2 -1

0

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Which subatomic particles have a charge?

Protons – positiveElectrons - negative

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What did JJ Thomson study and discover?

Electrons – because the cathode ray moved towards the positive node

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What did Rutherford study and discover?

He discovered positive protons in the nucleus

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What was James Chadwick’s contribution?

The neutron and its contribution to atomic mass

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All atoms contain a unique number of ______________.

protons

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Where would you find electrons?

Electron cloud – surrounding the nucleus

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What is an isotope?

Atoms of the same element with different #’s or neutrons

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Where do you find the radioactive elements?

After bismuth

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What is found in the nucleus?

Protons and neutrons

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What is an ion?

An atom that has gained or lost electrons – has a charge

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A cation has a __________ charge.

Positive

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Which form of radiation is stopped by clothing?

Alpha

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Complete the chart

Atom # protons # electrons # neutrons

calcium 20 20 20

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Write the chemical symbol for an ion with 35 protons and 36 electrons.

Br -1

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Complete the chart:Symbol # proton # electron # neutron Atom or

ion

38 proton 36 electron

49 neutrons87 Sr +2

ion38

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Write the alpha decay for:

223 Fr

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4 He + 219 At2 85