PLEASE HELP, with these 3 questions! Thank you
Moving from left to right across a period
elements become more metallic
elements become less metallic
elements have fewer valence electrons
elements become less reactive
One property of most metals in the solid state is that they are
brittle
nonconductors
malleable
dull
What are the most reactive nonmetals?
alkaline earth metals
noble gases
halogens
oxygen
Sure! I'd be happy to help with your questions. Here are the step-by-step answers to each question:
1. Moving from left to right across a period:
- Elements become more metallic: This is true. As you move from left to right across a period on the periodic table, elements generally become more metallic.
- Elements become less metallic: This is false. As you move from left to right across a period, elements become more metallic, not less metallic.
- Elements have fewer valence electrons: This is false. Moving from left to right across a period, the number of valence electrons generally increases, not decreases.
- Elements become less reactive: This is true. As you move from left to right across a period, elements become less reactive.
2. One property of most metals in the solid state is that they are:
- Brittle: This is false. Most metals are not brittle; instead, they are usually not easily broken.
- Nonconductors: This is false. Most metals are good conductors of electricity and heat, so they are not nonconductors.
- Malleable: This is true. Most metals can be hammered into thin sheets without breaking, which is why they are described as malleable.
- Dull: This is false. Most metals have a shiny or lustrous appearance, so they are not dull.
3. The most reactive nonmetals are:
- Alkaline earth metals: This is false. Alkaline earth metals are actually metals, not nonmetals.
- Noble gases: This is false. Noble gases are extremely unreactive due to their full outer electron shells, so they are not the most reactive nonmetals.
- Halogens: This is true. Halogens, such as fluorine, chlorine, bromine, and iodine, are highly reactive nonmetals.
- Oxygen: This is false. While oxygen can be reactive, it is not considered one of the most reactive nonmetals. Halogens are generally more reactive than oxygen.
I hope this helps! Let me know if you have any further questions.
Sure, I'd be happy to help you with these questions!
1. Moving from left to right across a period:
- elements become more metallic: As you move from left to right across a period in the periodic table, elements generally become less metallic. This is because, as you move towards the right, the number of valence electrons increases, making it harder for these elements to lose electrons and form positive ions, which is a characteristic of metals.
- elements become less metallic: As mentioned before, elements become less metallic as you move from left to right across a period.
- elements have fewer valence electrons: This statement is incorrect. As you move from left to right across a period, elements generally have more valence electrons until reaching the noble gases, which have a full valence shell.
- elements become less reactive: This statement is generally correct. As you move from left to right across a period, elements tend to become less reactive. This is because as you move towards the right, it becomes increasingly difficult for the elements to lose electrons and undergo chemical reactions.
2. One property of most metals in the solid state is that they are:
- brittle: Most metals are not brittle; they are generally malleable and can be hammered into thin sheets without breaking.
- nonconductors: The correct statement is that most metals are good conductors of electricity and heat. This is due to the presence of free electrons that can move freely within the metal structure.
- malleable: Yes, this is correct. Most metals are malleable, meaning they can be reshaped without breaking.
- dull: Most metals have a characteristic shiny or lustrous appearance when they are in the solid state, so the statement that they are dull is incorrect.
3. The most reactive nonmetals are:
- alkaline earth metals: Alkaline earth metals are actually metals, not nonmetals, so they are not the most reactive nonmetals.
- noble gases: Noble gases are not reactive at all; they have a full valence electron shell which makes them chemically stable and unreactive.
- halogens: Yes, this is correct. The halogens (fluorine, chlorine, bromine, iodine, and astatine) are the most reactive nonmetals. They readily react with metals to form salts and exhibit high reactivity due to their ability to gain one electron to achieve a full valence electron shell.
- oxygen: Oxygen is also a nonmetal, but it is not as reactive as halogens. It is highly reactive under certain conditions, but not the most reactive among the nonmetals.
I hope this helps! Let me know if you have any further questions.