Atom, Ion, Isotope & Periodic Table

How many electrons can the 2nd, 3rd, etc. energy levels each hold?

Metals typically lose electrons and become

The atomic number is always equal to the number of which subatomic particle?

The symbol for the element Hydrogen is

How does an atom become a cation?

Which class of elements is the largest group on the periodic table?

The size of atoms increases as you move

The nucleus of an atom contains protons and neutrons and has what type of charge?

In the element square, the larger of the two numbers is always the...

An atom of fluorine has an atomic # of 9 and a mass of 19. How many neutrons does it have?

Which element is in Group 4 (14) and Period 5?

The term "atom" comes from the Greek word "atomos" which means...

This subatomic particle is the smallest of the three subatomic particles.

Columns on the periodic table are called

Which element is in Group 1 and Period 3?

How many electrons can the first energy level (closest to the nucleus) hold?

An atom that has gained or lost electrons and has a negative or positive charge is called an

An atom has an atomic number of 32. What is the name of the element?

How does an atom become an anion?

True or False: The atomic number is always equal to the number of neutrons in an atom.

If an atom of chlorine gains one extra electron, it will have a charge of:

The atomic mass is equal to the number of protons + the number of

Who organized the elements into the first version of the periodic table of elements?

Which class of elements is made up of poor conductors of electricity?

Most of an atom is made up of

An isotope of Argon has 18 protons and 22 neutrons. How is the name of the isotope written?

Atoms of elements in Group 2 on the periodic table have how many valence electrons?

Neutrons are found where in the atom?

What is the maximum possible number of valence electrons in an atom?

Rows on the periodic table are called

As you move left to right across a period, what happens to the number of valence electrons?

Which class of elements shares the characteristic of being semiconductors?

An atom that has a different number of neutrons is called an

An atom is

Protons are found in the nucleus and have what kind of charge?

To find the number of neutrons in an atom, you subtract the atomic number from what?

Valence electrons are electrons found in the

In a neutral atom, the number of protons is always equal to the number of what?

A particle of calcium contains 20 protons and 18 electrons. Is it an...