The nucleus of an atom contains 56 neutrons.  The atom contains 43 electrons.  What element is it and what is the mass number of the isotope?

What particles are found in the nucleus of an atom? What is the charge of the nucleus?

Mercury An isotope of mercury has 80 protons and 120 neutrons. What is the mass number of this isotope?

Explain the operation of a cathode-ray tube. Describe the deflection of cathode rays by electrically charged plates placed within the cathode-ray tube. What does this imply about cathode rays?

Though the common isotope of aluminum has a mass number of 27, isotopes of aluminum have been isolated (or prepared in nuclear reactors) with mass numbers of 24, 25, 26, 28, 29, and 30. How many neutrons are present in each of these isotopes? Why are they all considered aluminum atoms, even though they differ greatly in mass? Write the atomic symbol for each isotope.

How are protons and neutrons similar? How are they different?

How is an atom’s atomic number related to its number ofprotons? To its number of electrons?

Give the atomic number (Z) and the mass number (A) for each of the following: a. a carbon atom with 8 neutrons b. an aluminum atom with 14 neutrons c. an argon atom with 20 neutrons d. a copper atom with 36 neutrons

The mass of an atom is almost entirely contributed by its a. nucleus. b. protons. c. electrons and protons. d. neutrons.

How many protons and neutrons are contained in the nucleus of each of the following atoms? In an atom of each element, how many electrons are present? a.2241Ti d.3686Kr b.3064Zn e.3375As c.3276Ge f.1941K