Chemistry B CP

How are the elements arranged on the periodic table today?

• By atomic mass

• By number of electrons

• By atomic number

• By alphabetic order

Who arranged the known elements into horizontal rows of increasing atomic mass leaving gaps for as yet undiscovered elements?

• Mendeleev

• Meyer

• Newlands

• Moseley

How many valence electrons does a halogen have? 

• 1

• 2

• 7

• 8

As you move down the periodic table atoms get bigger.  This is because ____________.

• The atoms have more mass.

• The atoms have more protons.

• The atoms have more energy levels

• The atoms have more nuetrons

Ionization energy __________ as you do across a period

• has no pattern

• stays the same

• decreases

• increases

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which molecule would have this molecular geometry?

• BF₃

• CH₄

• PCl₅

• CO₂

Tags

NGSS.MS-PS1-1

What molecular shape is the structure shown here? (H₂O)

• tetrahedral

• trigonal planar

• bent

• trigonal pyramidal

Tags

NGSS.MS-PS1-1

When one atom transfers one or more valence electrons to another atom, a(n) __________ is formed.

• covalent bond

• ionic bond

• metallic bond

• hair bond

Tags

NGSS.MS-PS1-5

When electron(s) are shared between two or more atoms, they form?

• Covalent bond

• Ionic bond

• Metallic bond

• Carbon bond

According to the octet rule most elements need _______ valence electrons.

• 2

• 8

• 6

• 18