--- An atom of element X contains 15 electrons and 16 neutrons.

(a). (I) State the mass number of X.
(ii) Write the electronic
configuration of X.
(b) (I) Write the formula of a chloride of X. pliz , it's urgent. ​

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: