Investigation 2 Test

The effective nuclear charge, Zeff, experienced by valence electrons in an atom can be estimated from the equation: Zeff = the number of protons – the number of core electrons

Using this estimation, effective nuclear charge for Main Group elements would _________ left to right across a period and _______ down a group. Which option correctly completes the blanks in the statement?

• increase; decrease

• increase; remain the same

• decrease; remain the same

• remain the same; remain the same

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How do core electrons differ from valence electrons? Choose all that apply (2)

• Core electrons are found on the lower energy levels, while valence electrons are in the outermost energy level

• Valence electrons shield, core electrons do not

• Core electrons shield, valence electrons do not

Which statements are true concerning elements in the same group of the periodic table? Select all that apply. (2)

• They have similar Physical and Chemical properties.

• They have the same number of shells of electrons.

• They have the same outer shell electron configuration (Valence electrons)

• They are all metals or nonmetals, but not both.

Tags

NGSS.HS-PS1-1

The valence electrons of an atom do not experience the full attractive force of protons in the atom's nucleus due to the presence of inner core electrons. The reduction in nuclear charge experienced by valence electrons due to inner core electrons is called the

• ionization energy effect

• nuclear charge effect

• periodic law effect

• shielding effect

Tags

NGSS.HS-PS1-1

Which elements are good conductors of electricity and heat?

• Metals

• Nonmetals

• Metalloids

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

• Octet rule

• Group rule

• Actinide

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The concept of shielding happens because of

• attraction between nucleus and valence electrons

• attraction between nucleus and core electrons

• repulsion between valence electrons and other valence electrons

• repulsion between core electrons and valence electrons

Shielding electrons causes the force of attraction to the nucleus to 

• increase

• decrease

The effective nuclear charge is _____ the actual nuclear charge

• equal to

• less than

• greater than

Tags

NGSS.HS-PS1-8

Which description accurately represents an anion?

• an atom that gains one or more electrons

• 
  an atom that loses one or more electrons

• atoms that don't gain or lose electrons