Radioactivity

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Radioactive and atom

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Creasia Sherlly Jounie

Malasia

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Radioactivity


Froggy Jumps RadioactivityVersión en línea Radioactive and atom por Creasia Sherlly Jounie 1 Which scientist is credited with the discovery of X-rays in 1895 while using a vacuum tube? a Ernest Rutherford b John Dalton c Wilhelm Conrad Roentgen 2 Which of the following best describes the process of radioactivity? a A random and spontaneous decay of an unstable nucleus b The loss of electrons from the outer shells of a neutral atom c The fusion of two nuclei to form a heavier, more stable atom 3 What are the three types of radioactive radiation emitted during spontaneous decay? a X-ray, Ultraviolet and Visible light b Alpha, Beta and Gamma c Proton, Neuron and Electron 4 If a radioactive source has an activity of 2 Ci, what is its activity in the S.I. unit of becquerel (Bq)? a 1.85 x 10^10 Bq b 2.0 Bq c 7.4 x 10^10 Bq 5 How is the half-life (T 1/2) of a radioactive substance defined? a Time taken for the number of undecayed nuclei to reduce to half its original value b Time taken for the mass of an atom to double c Total lifespan of a radioactive element before it disappears 6 A radioactive substance Q has an initial activity of 160 Bq. If its half-life is 10 minutes, what will its activity be after 30 minutes? a 20Bq b 40 Bq c 80 Bq 7 According to Dalton’s Atomic Theory introduced in 1808, what is the nature of an atom? a It is a particle that can be easily split into protons and neutrons b It is sphere of positive charge with embedded electrons c It is the smallest particle and cannot be further divided 8 Which of the following conditions results in a neutral atom? a The atom has gained an extra electron to fill its outer shell b e number of proton is equal to the number of electrons c The atom has lost a proton from its nucleus 9 When an atom loses electrons, what does it become? a A negative ion (anion) b A positive ion(cation) c A stable, neutral molecule 10 A Magnesium atom (Mg) has 12 protons and 12 electrons. If it loses two electrons to form a Magnesium ion (Mg2+ ), what is the final net charge? a +2 b 0 c -2 11 A Fluorine atom (F) has 9 protons and 9 electrons. When it gains one electron to form a fluoride ion (F −), what are the resulting subatomic particle counts? a 9 proton 10 electrons b 10 proton 10 electrons c 10 proton 9 electrons 12 Which radioactive isotope is specifically mentioned as an example of an element with an unstable nucleus that decays spontaneously? a b Magnesium-24 c Nitrogen-14

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Radioactivity

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RadioactivityVersión en línea

por Creasia Sherlly Jounie

Which scientist is credited with the discovery of X-rays in 1895 while using a vacuum tube?

Which of the following best describes the process of radioactivity?

What are the three types of radioactive radiation emitted during spontaneous decay?

If a radioactive source has an activity of 2 Ci, what is its activity in the S.I. unit of becquerel (Bq)?

How is the half-life (T 1/2) of a radioactive substance defined?

A radioactive substance Q has an initial activity of 160 Bq. If its half-life is 10 minutes, what will its activity be after 30 minutes?

According to Dalton’s Atomic Theory introduced in 1808, what is the nature of an atom?

Which of the following conditions results in a neutral atom?

When an atom loses electrons, what does it become?

A Magnesium atom (Mg) has 12 protons and 12 electrons. If it loses two electrons to form a Magnesium ion (Mg2+ ), what is the final net charge?

A Fluorine atom (F) has 9 protons and 9 electrons. When it gains one electron to form a fluoride ion (F −), what are the resulting subatomic particle counts?

Which radioactive isotope is specifically mentioned as an example of an element with an unstable nucleus that decays spontaneously?