Chem H Final

What did Mendeleev notice when he arranged elements in order of increasing atomic mass?

• Elements became radioactive

• Similarities in chemical properties appeared in regular intervals

• Elements lost their properties

• Elements changed color

What was a major problem with Mendeleev’s periodic table?

• It did not include any metals

• Some elements had to be placed out of order of atomic mass to group similar properties

• It was arranged by atomic number

• It only included gases

What does the length of each period in the periodic table depend on?

• The number of protons in the nucleus

• The number of electrons that can occupy the sublevels being filled in that period

• The number of neutrons in the atom

• The color of the element

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which sublevels are filled in the 4th period of the periodic table?

• 4s4d4p

• 4s4p4d

• 4s3d4p

• 4p4d4f

Tags

NGSS.HS-PS1-1

Why does the atomic radius decrease as you move across a period?

• The number of energy levels increases.

• The number of protons increases, pulling electrons closer.

• The number of neutrons decreases.

• The atom gains more electrons in the outer shell.

Tags

NGSS.HS-PS1-1

What is ionization energy?

• The energy required to add an electron to an atom.

• The energy required to remove one electron from an atom.

• The energy released when an atom forms a bond.

• The energy needed to split an atom.

Tags

NGSS.HS-PS1-1

Which of the following best explains why the ionic radius of nonmetals increases when they form anions?

• More protons are added, increasing attraction

• More electrons are added, increasing repulsive forces

• Fewer electrons are present, decreasing repulsion

• The nucleus becomes larger

Which trend is observed for atomic radius as you move from left to right across a period?

• Atomic radius increases

• Atomic radius decreases

• Atomic radius stays the same

• Atomic radius fluctuates

What is the electronegativity difference range for a polar covalent bond?

• 0.3 – 1.7

• 0.0 – 0.3

• 1.7 and greater

• 2.0 – 3.0

Which type of bond is formed between atoms of metals and nonmetals, or contains polyatomic ions?

• Covalent bond

• Metallic bond

• Ionic bond

• Hydrogen bond