Modern Chemistry Ch. 5

Because of the complex behavior of electrons, scientists describe the location of electrons using orbitals. How do orbitals differ from orbits?

• orbitals are spaces, not paths

• orbitals are larger than orbits

• orbitals= orbits

• orbitals are tiny, microscopic orbits

Adding or subtracting neutrons (charge = 0, mass = 1) makes the element change into an...

• ion

• isotope

• mixture

• neutral atom

The atomic number is equal to _.

• the number of protons

• the total number of protons and neutrons

• the number of neutrons only

• the number of protons neutrons and electrons

What is the charge on a lithium atom that looses 1 electron?

• +1

• -1

• 0

• -2

Is the element shown in this image wanting to be an ion, isotope or normal atom?

• atom

• isotope

• cation (+ ion), loses an electron

• anion (- ion), gains an electron

How many protons does this isotope of titanium have?

• 48

• 26

• 22

• 70

What's a valence electron?

• electrons in the second energy level

• the atomic number

• electrons in the outermost energy level

• electrons in the first level

How many valence electrons are in Phosphorus?

• 15

• 5

• 4

• 31

How many electrons are in the outer shell of Sodium (Na)?

• 3

• 2

• 1

• 4

When the number of electrons equals the number of protons the atom has what charge?

• negative charge

• positive charge

• neutral charge

• ionic charge