History of periodic table 3/4A

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.

Who arranged the periodic table by increasing atomic number?

• Mendeleev
• Rutherford
• Bohr
• Mosely

_______________ developed the first periodic table and arranged the elements in order of increasing atomic mass.

• Stevie Wonder
• Sasha Vujacic
• Dmitri Mendeleev
• James Mosely

Which property did Mendeleev use to order his periodic table?

• Shielding effect
• Eletronegitivity
• Atomic Weight
• Metallic Character

In an element box, the number at top is the

• atomic number

• atomic name

• atomic mass

• atomic symbol

Tags

NGSS.HS-PS1-1

Rows in the Periodic Table are called

• Periods

• Groups/Families

• Cousins

• Metals

Tags

NGSS.HS-PS1-1

The nucleus of an atom is located in its

• electron cloud

• center

• proton

• backpack

Tags

NGSS.MS-PS1-1

All matter is made of

• electrons

• protons

• neutrons

• atoms

Tags

NGSS.MS-PS1-1

Periods on the periodic table are __________.

• Horizontal Rows
• Vertical Columns