Answer:
1. What similarities do you notice
Within a group(column)?
Within a row (period)?
2. Locate the element in Period 4, Column 1.
Predict the number of valence electrons.
Predict the Lewis Dot Structure
Answer
given,
mass of book = 0.305 Kg
so, from the diagram attached below
computing horizontal component
θ = 62.35°
Explanation:
It depends because the higher the object is, the bigger the shadow, however, the object should be close to the line directly from the sun, for you to see the shadow visible.
a) Proton-proton: high repulsive electrostatic, very high attractive nuclear force. Proton-neutron: no electrostatic forces since neutrons are not charge carriers, high attractive nuclear force. Neutron-neutron: no electrostatic force for the same reason and huge attractive nuclear force.
b) There are two types of forces in the nuclei: repulsive electrostatic and attractive nuclear. Nuclear act between all nucleons, electrostatic only between protons. To make a nucleus stronger, increase number of attractive forces by increasing amount of neutrons.
c) Cause due to equivalence between mass and energy E=mc^2 change in energy (which happens in nuclear reaction) causes on change in mass. Starting mass just converts to energy, that's why it's greater than the ending mass.
The resolution of the angles measured (which is to 2d.p) is greater than the resolution that a normal protractor would show (no d.p)
e.g You can't really put a protractor down and say that's exactly 27.94 degrees, so something more accurate must've been used
