Hey :)
Ernest Rutherford produced the nuclear model of the atom
In 1909 Ernest Rutherford designed an experiment to test the plum pudding model
In the experiment, positively charged alpha particles were fired at thin gold foil. Most alpha particles went straight through the foil
This evidence led Rutherford to suggest a new model for the atom, called the nuclear model
Hope this helps :)
Explanation:
We know that Ionic radius increases on going downwards in any group. In group 15, the last elements Sb and Bi have ionic radii lesser than the rest of its elements i.e N,P and As.
This is due to the fact that Sb and Bi have completely filled d and f sub-shells which have least shielding effect.
Thus, they do not guard the valence electrons to a greater extent due to which the valence electrons feel almost whole nuclear charge.
This, results into attraction of valence electrons towards nucleus and hence size decreases.
Answer:
5:22 am
Explanation:
The gas X decays following a first-order reaction.
The half-life () is 25 min. We can find the rate constant (k) using the following expression.
We can find the concentration of X at a certain time () using the following expression.
where,
: initial concentration of X
t: time elapsed
The earliest time Professor Utonium can come back to do experiments in the lab is:
4:00 + 82 = 5:22 am