A particle is projected between two electrically charged plates as shown below. A beta ray is also shown in comparison. Is the particle an electron?

Identify the correct statement about the atomic number and mass number of an atom.

Determine if the statement below is true: 

The nucleus is made up mostly of neutrons which make up most of the mass and volume of an atom. 

Identify the symbol, number of protons, and number of neutrons for the unknown isotope ¹⁹⁰₇₈X

Identify which among the isotope symbols below is incorrect.

(i) ⁴⁰₁₉P  (ii) ¹²⁰₅₀Sn  (iii) ²⁹₆₃Cu   (iv) ¹⁰⁹₄₇Au  (v) ⁵⁸₂₆Fe

The number of neutrons (n) and protons (p) for four isotopes is given in the table. What are their symbols?

Which characteristic do the neutral atoms of all isotopes of the same element share?

Provide missing values.

Symbol         Ion            # of Electrons in Ion            # of Protons in Ion.
_                   Ga³⁺          _                                           31
Ba                 Ba²⁺          _                                           _
F                   _                _                                           9
Po                 _               86                                         _

The subatomic particles in ions are different in the number of 

Identify the set that has all species with the same number of electrons. What do we call this type of relationship? 

a. Rb⁺, Kr, Sr²⁺ 

b. C, N^3-, F^-

c. Na⁺, Sr²⁺, Ba²⁺ 

The natural isotopes of sulfur are listed below:
³²S, 94.99%, 31.972 amu
³³S, 0.75%, 32.971 amu
³⁴S, 4.25%, 33.968 amu
³⁶S, 0.01%, 35.967 amu

Calculate the atomic weight of sulfur.

Calculate the relative abundances of the isotopes of boron if Boron-10 has a mass of 10.0129 amu and Boron-11 has a mass of 11.0093 amu.

The mass spectrum of an element displayed four peaks with varying intensities indicative of four isotopes. Given the following information, determine the mass of the element and its identity.

Isotope 1: Mass (amu): 83.91343; Abundance (%): 0.5600

Isotope 2: Mass (amu): 85.90926; Abundance (%): 9.860

Isotope 3: Mass (amu): 86.90888; Abundance (%): 7.000

Isotope 4: Mass (amu): 87.90561; Abundance (%): 82.58

Which of the following best describes a semimetal/s?