Subatomic Particles, Ions, Isotopic Symbols

The atomic number =

• the number of protons

• the mass number

• the number of neutrons

• the specific heat capacity

Zirconium (Zr) has an atomic mass of 91.22. How many neutrons would be in the nucleus of this atom?

• 91

• 40

• 51

• 131

The electrons in an atom are located:

• in the nucleus

• bonded to the protons

• orbiting the nucleus

• somewhere, but not sure where

For any atom of an element,

• the protons are always equal to the electrons

• the mass never changes

• the protons are equal to the number of neutrons

• all the atoms are exactly the same.

A potassium atom has 19 p⁺, 19 e^- and 20 n^o. Its mass number is:

• 38

• 39

• 40

• 58

The isotope Ba-140 has:

• 140 neutrons

• 81 neutrons

• 137 neutrons

• 84 neutrons

Gold has an atomic number of 79. It will generally have:

• 79 electrons

• 79 neutrons

• 118 electrons

• A mass number of 196.

What is true about the isotope N-15? (check all that are true)

• It has 7 protons

• It has 7 electrons

• It has 7 neutrons

• It has a mass number of 15

• It is the most common isotope of N.

The atomic mass of Palladium (Pd) is 106.4. How many protons are in its nucleus?

• 106

• 46

• 60

• Maybe 48.

I am an isotope of an atom with a mass number of 206. My nucleus contains 125 neutrons. Who am I?

• lead

• thallium (Tl)

• bismuth (Bi)

• mercury