Periodic Table

In the modern periodic table elements are arranged by:

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Why were there blank spaces left in Mendeleev's periodic table?                                              

• He didn't know what to put there.
•  Undiscovered elements not yet known.
• Multiple elements could have fit
• He forgot to add the elements in.

Which property did Mendeleev use to order his periodic table?

• Shielding effect

• Eletronegitivity

• Atomic Mass

• Metallic Character

An atom that has the electron configuration of 1s²2s²2p⁶3s²3p⁶4s²3d⁵ is classified as

• A transition element
• a noble gas
• an alkali metal
• an alkaline earth metal

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The vertical columns on the periodic table are called:

• periods

• elements

• groups

• matter

The horizontal rows on the periodic table are called:

• periods

• elements

• groups

• matter

A rule that states that repeating chemical and physical properties of elements change periodically with the atomic number of the elements is the _________.

• periodic law
• alkaline-earth metals
• actinide
• group rule

Tags

NGSS.HS-PS1-1

Elements in a ..................have similar chemical properties.  

• period
• group
• row

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

According to the Periodic Table of the Elements, which set of elements has similar properties?

• H, C, I
• He, H, Al
• He, Ne, Ar
• Na, Ca, Al

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The majority of elements on the periodic table are:

• radioactive.

• nonmetals.

• metals.

• gases.