Answer:
17
Explanation:
the mass number of the element which is protons and neutrons is 17+18=35
electronic configuration is 2, 8, 7
valency of the element is 1 therefore the atomic number is 17
Answer:
The table tennis balls represent neutrons that are released when the nucleus splits and cause other nuclei to split
Explanation:
Nuclear fission is defined as the separation of a nucleus into two smaller nuclei.
It takes a neutron to set off a nuclear fission reaction. When that occurs, neutrons are released and those neutrons in turn are what set off other nuclear fissions. This is defined as a Nuclear Fission Chain Reaction. In the model, the one tennis ball that will be thrown will be modeled as the starting neutron that sets of the initial (first) fission. The mouse traps with tennis balls represent the other nucleuses waiting to be struck by the one tennis ball. Once the initial tennis ball strikes the first mouse trap, that mouse trap will release its tennis ball hitting others and continuing the cycle.
It can also be modeled as such:
The fossil could get damaged and broken into smaller pieces. That is a way it could make it difficult to determine the fossils age.
Amount of charge on the test charge
Answer : 2.31 moles of Helium was initially present in the balloon.
Explanation : Calculating the initial number of moles of helium in the balloon we need to use this method,
final moles present - 14.6 mol
Volume increased from 358.5 mL (= 0.3585 L ) to 2.26 L
<span>(14.6 mol) x (0.3585 L / 2.26 L) = 14.6 moles X 0.158 L = 2.31 moles / L</span>
<span>
</span>
<span>Hence, the initial moles was 2.31 moles/L in the helium balloon. </span>