HS-PS1-1: Properties of Elements

What does the atomic number of an element represent?

• Number of neutrons

• Number of protons

• Number of electron shells

• Atomic mass

Elements in the same group of the periodic table have the same:

• Atomic number

• Number of electron shells

• Number of valence electrons

• Atomic mass

Which element is most chemically similar to sodium (Na)?

• Magnesium (Mg)

• Lithium (Li)

• Neon (Ne)

• Iron (Fe)

As you move across a period from left to right, atomic radius:

• Increases

• Decreases

• Stays the same

• Randomly fluctuates

Which group contains the most reactive nonmetals?

• Group 1 (Alkali Metals)

• Group 2 (Alkaline Earth Metals)

• Group 17 (Halogens)

• Group 18 (Noble Gases)

Which trend increases as you move from left to right across a period?

• Atomic radius

• Ionization energy

• Metallic character

• Reactivity of metals

Noble gases are generally unreactive because:

• They have high atomic numbers

• They have a full valence electron shell

• They have low electronegativity

• They have strong intermolecular forces

The most electronegative element is:

• Oxygen

• Fluorine

• Nitrogen

• Carbon

Which of the following elements is a metalloid?

• Silicon (Si)

• Calcium (Ca)

• Argon (Ar)

• Gold (Au)

Which of the following best describes a transition metal?

• Highly reactive, forms +1 ions

• Forms colorful compounds and has multiple oxidation states

• Gases at room temperature

• Does not conduct electricity