Question

Which element has four valence electrons?
(1 point)
beryllium (Be)
potassium (K)
silicon (Si)
sulfur (S)
Answer
A) Which statement best explains why hydrogen’s atomic number is equal to its mass?
(1 point)
Hydrogen is in the first row and the first column of the periodic table.
Hydrogen is stable, with two electrons in its outer shell.
Hydrogen only has one electron
Hydrogen does not have any neutrons.
Answer
Which statement correctly compares the valence electrons for atoms of francium (Fr) and
barium (Ba)?
(1 point)
Francium has more valence electrons, and they are in a higher energy level.
Barium has fewer valence electrons, but they are in a higher energy level.
Barium has more valence electrons, and they are in a higher energy level.
Francium has fewer valence electrons, but they are in a higher energy level.
Answer
A) Why are the noble gases the least reactive elements? (1 point)
They are the most electronegative elements.
They are the elements with the smallest atomic mass.
They have an empty inner electron shell.
They have a full valence electron shell.
Answer
A) Group 2 elements have two valence electrons. Which kind of bond will they most likely form,
and why? (1 point)
An ionic bond is likely because they will want to give away two valence electrons in order to
become stable.
A metallic bond is likely because they are metals and can bond with other metals.
A covalent bond is likely because they want to share those two valence electrons in order to
become stable.
An ionic bond is likely because they are metals and will want to bond with nonmetals.
Answer
A) How many electrons can carbon accept from other atoms while bonding? (1 point)
four
eight
six
two
Answered by GPT-4o mini
The element with four valence electrons is silicon (Si).
Answered by GPT-4o mini
The statement that best explains why hydrogen’s atomic number is equal to its mass is:

**Hydrogen does not have any neutrons.**

This is because hydrogen has an atomic number of 1 (which means it has one proton) and the most common isotope of hydrogen (protium) has no neutrons, giving it an atomic mass of approximately 1.
Answered by GPT-4o mini
The correct statement is:

**Francium has more valence electrons, and they are in a higher energy level.**

Both francium (Fr) and barium (Ba) have one valence electron, as they are both in Group 1 of the periodic table (alkali metals for francium and alkaline earth metals for barium), but francium is located in a higher period (or energy level) than barium. Therefore, the valence electrons of francium are indeed in a higher energy level.
Answered by GPT-4o mini
The correct answer is:

**They have a full valence electron shell.**

Noble gases are the least reactive elements because their outer electron shells are full, which makes them stable and less likely to participate in chemical reactions.
Answered by GPT-4o mini
The correct statement is:

**An ionic bond is likely because they will want to give away two valence electrons in order to become stable.**

Group 2 elements (alkaline earth metals) typically lose their two valence electrons to achieve a stable electron configuration, forming positive ions (cations) and are likely to react with nonmetals to form ionic bonds.
Answered by GPT-4o mini
Carbon can accept **four** electrons from other atoms while bonding.

Carbon has four valence electrons and can form four bonds with other atoms, allowing it to achieve a full outer shell of eight electrons (the octet rule) by either sharing (covalent bonds) or accepting electrons.