Answer:
<h2>Letter B</h2>
Explanation:
because density is an INTENSIVE PROPERTY not an EXTENSIVE.
The relative atomic mass is the weighted average mass of elements relative to 1/12th the mass of a 12-C atom.
Isotopes are atoms of the same element with different masses , in other words different numbers of neutrons.
Relative atomic mass =sum of (mass x percentage )
R.a.m = 62.9300 x 69.15% + 64.9200 x 30.85%
= 43.52 + 20.03
= 63.55 amu
K= [Ar] 4s^1
Pb= [Xe] 6s^2 5d^10 6p^2
Sc= [Ar] 4s^2 3d^1
Ra= [Rn] 7s^2
O= [He] 2s^2 2p^4
Ag= [Kr] 5s^2 4d^9
Ru= [Kr] 5s^1
Ce= [Xe] 6s^2 5d^1 4f^1
I= [Kr] 5s^2 4d^10 5p^5
F= [He] 2s^2 2p^5
Answer: D . A car that moves at a constant speed in one direction.
Explanation: D is the answer because a car moving in a constant speed represents a balance force because the speed is constant and the forces are balanced or , when a car travels at a constant speed, the driving force from the engine is balanced by resistive forces such as air resistance and friction in the car's moving parts.
Red shift is one piece of observational evidence which supports the big bang theory. The fact that galaxies are moving away from us means that the universe was once much smaller, supporting the big bang theory which states that all the matter in the universe once occupied a single point with infinite density.
