Atomic Trends

Arranged the elements on the periodic table based on atomic number

• Dmitri Mendeleev

• John Dalton

• Niels Bohr

• Henry Moseley

Boron, carbon, nitrogen and oxygen are all members of the same....

• Family

• Group

• Period

• Valence level

Tags

NGSS.HS-PS1-1

Which of these best explains the reasoning behind the trend that as you go across a period, size decreases?

• As you go across a period, more energy levels are added, which shrinks the atom.

• The added electrons in the nucleus give the atom a negative charge, which shrinks the atom.

• The added protons in the nucleus pull the electrons closer to them, which shrinks the atom.

• All of the above

Explain why ionization energy decreases as you go down a group.

• Outer electrons are further away from the nucleus you go down a group

• Electrons feel less pull from the nucleus as you go down a group

• Electrons are easier to remove as you go down a group

• All of the above

What is the atomic radius?

• The distance from the nucleus to the outermost electron of an atom

• The distance from one side of an atom to the other side

• The distance around the atom

• The distance between atoms in the gas phase

• The distance between atoms in the solid phase

Which element's atom is larger? Nitrogen or Phosphorus?

• Nitrogen

• Phosphorus

Tags

NGSS.HS-PS1-1

As you move ______ a group, more energy levels are added, which increases the size of the atom

• down

• up

• diagonal

• away

Which element's atom is the smallest?

• Rhodium

• Silver

• Cadmium

• Tin

Tags

NGSS.HS-PS1-1

Electronegativity is...

• how good an atom is at attracting electrons

• the ability of an atom to lose electrons

• the energy required to remove an electron from a specific atom

• how easy it is to make friends. 

Tags

NGSS.HS-PS1-2

As you look from left to right across a period, electronegativity

• increases

• decreases

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2