Answer:
C. 
Explanation:
Molecules with the stronger intermolecular forces are pulled tightly together to form solid at higher temperatures and that's why the freezing point is higher.
Also, molecules with the stronger intermolecular force have greater interaction between the molecules and thus on heating do not boil easily and have high boiling point also.
Thus, melting point and boiling point increases with increase in number of carbon atoms and also increase in intermolecular forces (like hydrogen bonding, if present).
Thus, the compound which is gas at room temperature is <u>because it has least number of carbon atoms and absence of hydrogen bonding.</u>
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Energy increases with increasing frequency.
Answer:
Transition metals and lanthanide metals
Explanation:
Alkali metals, alkaline earth metals, halogens, and noble gases are all part of the main group elements.
Periods and families simply refer to the rows and columns of the periodic table. They don't specify the type of element.
Answer:
By satisfying the duet rule or the octet rule, ions are more stable.
Explanation:
Ionic bonds are formed through the exchange of valence electrons between atoms, typically a metal and a nonmetal. The loss or gain of valence electrons allows ions to obey the octet rule and become more stable.
The octet rule states that an atom is most stable when there are eight electrons in its valence shell. Atoms with less than eight electrons tend to satisfy the duet rule, having two electrons in their valence shell. By satisfying the duet rule or the octet rule, ions are more stable.
<em>I HOPE THIS HELPS!!!!</em>
The p block represents the non-metals while the s and d blocks represent the metals. Non-metals (p block) usually have 4 or more valance electrons that they want to give away, and for this reason they tend to form negative ions. Non-metals are dull, are poor conductors of heat and electricity, have low density, and have low melting and boiling points. On the other hand, the metals (s and d block) usually have 3 or fewer valance electrons and tend to form positive ions. They are shiny, are good conductors of heat and electricity, have a high density, and have high melting and boiling points.
