Periodic Table

A mystery element has 18 protons. Which one of the following statements is true about the element?

• The element belongs in row 2 of the periodic table and is classified as a halogen.

• The element belongs in row 3 of the periodic table and is classified as a noble gas.

• The element belongs in row 4 of the periodic table and is classified as an alkali metal.

• The element belongs in row 5 of the periodic table and is classified as an alkaline earth metal.

Tags

NGSS.HS-PS1-1

Match the following

• chlorine

• This element is unstable

• californium

• This element is a gas with an effective nuclear charge of +7

• carbon

• The element is malleable

• neon

• This element is a non reactive gas at room temperature

• copper

• This element is a solid which does not conduct electricity

Tags

NGSS.HS-PS1-1

Group 1 metals are highly ​ (a)   since they easily ​ (b)   to form ions

• reactive
• unreactive
• lose 1 electron
• gain 1 electron
• gain 2 electrons
• lose 2 electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Reorder the following in order of atomic size from smallest to largest

• Ne

• C

• O

• Be

• Li

chlorine has ​ (a)   valence electrons and the effective nuclear charge, Z_eff, for chlorine is ​ (b)  

• 7
• +7
• 1
• +1
• 5
• +5

Tags

NGSS.HS-PS1-1

Reorder the following in order of increasing ionization energy (from left to right)

• Li

• Cs

• Rb

• Na

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

With the exception of He, how many valence electrons do noble gases have?

• 1

• 4

• 6

• 8

Tags

NGSS.HS-PS1-1

Which of the following elements have larger atomic radii that S? Select all that apply​ ​ ​ ​ ​

• Se
• Cl

• Ar

• O

Tags

NGSS.HS-PS1-1

The element in period 3 with the largest atomic radius is

Tags

NGSS.HS-PS1-1

The element in period 3 with the highest ionization energy is

Tags

NGSS.HS-PS1-1