Question

question 23 (1 point)
to what category of elements does an element belong if it is a poor conductor of electricity?
o a nonmetals
b metalloids
o c metals
d transition elements

question 24 (1 point)
in which of the following sets is the symbol of the element, the number of protons, and the number of electrons given correctly?
o a cs, 55 protons, 132.9 electrons
b in, 49 protons, 49 electrons
o c f, 19 protons, 19 electrons
d zn, 30 protons, 60 electrons

question 25 (1 point)
which of the following is true about the electron configurations of the noble gases?
o a the electrons with the highest energy are in an f sublevel.
b the highest occupied s and p sublevels are partially filled.
o c the electrons with the highest energy are in a d sublevel.
d the highest occupied s and p sublevels are completely filled.

Explanation:

Question 23

• Metals are good conductors of electricity.
• Metalloids have intermediate conductivity (semiconductors in some cases).
• Transition elements (a subset of metals) are also good conductors.
• Non - metals are generally poor conductors of electricity.

• For a neutral atom, the number of protons = number of electrons.
• In option a: Electrons must be an integer (132.9 is not valid for number of electrons).
• In option c: Fluorine (F) has 9 protons (atomic number of F is 9).
• In option d: For a neutral Zn atom, if there are 30 protons, there are 30 electrons.
• In option b: Indium (In) has atomic number 49, so for a neutral In atom, protons = electrons = 49.

• Noble gases have a full valence shell. The valence shell consists of \(s\) and \(p\) sub - levels.
• For example, helium (\(He:1s^{2}\)), neon (\(Ne:2s^{2}2p^{6}\)) etc.
• The highest occupied \(s\) and \(p\) sublevels are completely filled.
• They do not have electrons in \(d\) or \(f\) sublevels in their valence shell (except for some heavier noble gases in excited states, but in the ground - state noble gas electron configuration context).

Answer:

A. nonmetals

Question 24