Atoms light

****Atoms
Think and Compare: Page 331
Q-3 Consider these atoms: hydrogen H, aluminum Al, argon, Ar. Rank them, from smallest to largest, in order of (a) size; (b) number of protons in the nucleus; (c) number of electrons.

In order of size from smallest to largest: Hydrogen H, Argon Ar, Aluminum Al.
In order of proton from smallest to largest: Hydrogen H, Aluminum Al, Argon Ar.
In order of electron from smallest to largest: Hydrogen H, Aluminum Al, Argon Ar.

Q-4 Consider these atoms: helium He, chlorine Cl, and argon Ar. Rank them in terms of their atomic number, from smallest to largest.

In terms of their atomic number from smallest to largest: Helium He, Chlorine Cl, Argon Ar.

Think and Explain: Page 331&332
Q7
Oxygen has the atomic number 8, so it has 8 protons. Almost all oxygen has 8 neutrons, for an atomic mass number of 16. If you remove 2 of each you have an atomic number of 6 and a mass number of 12 (6 protons, 6 neutrons). If you look at the element Carbon C, it has an atomic number of 6 and a mass number of 12.

Q8
The atomic mass is 99 and the element is technetium (Tc). Atomic mass is found by adding the neutrons and protons.

Q12
The protons contribute much more than electrons to the atomic mass, but because they are held within the atomic nucleus, which is only a tiny fraction of the volume of the atom the size is defined by the electron.

Readiness Assurance Test (RAT): Page 332 & 333
Q5 --- Answer A - B - C - D
Q6 --- Answer A - B - C - D
Q9 --- Answer A - B - C - D

****Light
Think and Explain: Page 284
Q1
Radio waves have longer wavelengths compared to x rays and light waves. X rays has the highest frequencies.

Q2
Glass is transparent to light. It allows light to pass through in straight line.

Readiness Assurance Test (RAT): Page 286
Q1 --- Answer A - B - C - D
Q6 --- Answer A - B - C - D
Q8 --- Answer A - B - C - D
Q10 --- Answer A - B - C - D