Week 2: Periodic Trends and the Atom

What was Mendeleev able to predict based on his version of the periodic table?

• Abundance percentages

• Where elements could be found in the world

• Physical and chemical properties of elements

• Structures of the electrons

Tags

NGSS.HS-PS1-1

The atom with the largest atomic radius in Group 18 is - 

• Ar
• He
• Kr
• Rn

Tags

NGSS.HS-PS1-1

The atom with the largest atomic radius in Period 4 (row 4) is - 

• K
• Kr
• Fe
• Fe

Atomic Radius is...

• the relative size of the atom's nucleus
• the relative size of the atom's electron cloud
• the energy required to shield the outer electrons from the nucleus
• a measure of the ability of an atom to attract electrons

What term is used to describe "A measure of the size of an atom"

• chemical reactivity
• atomic radius
• energy levels
• orbit

If I am an atom that has 7 valence electrons, what family/group am I in?

• Alkali metals (group 1A)

• Alkaline Earth metals (group 2A)

• Noble Gases (group 8A)

• Halogens (group 7A)

Tags

NGSS.HS-PS1-1

How did Mendeleev arrange the elements?

• alphabetical

• density

• melting point

• atomic mass (weight)

Tags

NGSS.HS-PS1-1

What was the name of JJ Thomson's model of the atom that he used the Cathode Ray experiment to discover?

• Plum pudding model

• Nuclear model

• Planetary model

• Billiard ball model

This was the first model of the atom ever proposed. It was simple and described atoms as tiny spheres that could not be broken down into smaller pieces.

• Democritus's model of the atom
• The "Plum Pudding Model" of the atom
• The "Rutherford Model" of the atom
• The "Quantum Mechanical Model" of the atom

Ernest Rutherford discovered that atoms were mostly _________________. 

• negatively charged
• positively charged
• electrons
• empty space.