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Author Question: What happens to the mass number and the atomic number of an element when it undergoes alpha decay? ... (Read 67 times)

sjones

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on: Aug 27, 2018
What happens to the mass number and the atomic number of an element when it undergoes alpha decay?
 
  A) The mass number decreases by 4 and the atomic number decreases by 2.
  B) The mass number does not change and the atomic number increases by 1.
  C) The mass number increases by 4 and the atomic number does not change.
  D) The mass number increases by 2 and the atomic number decreases by 1.
  E) The mass number does not change and the atomic number increases by 2.

Question 2

Why was helium absent from Mendeleev's original periodic table of 1871?
 
  A) Helium is unstable.
  B) Helium is radioactive.
  C) Helium had not been discovered.
  D) Helium occurs only in compounds.
  E) none of the above
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duy1981999

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Reply #1 on: Aug 27, 2018
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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sjones

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Reply 2 on: Aug 27, 2018
Wow, this really help

jojobee318

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Reply 3 on: Yesterday
Excellent

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