Is there a picture of the model? Who's Dalton? What other models? Please explain and give answer choices if you can--- that'll help you help you here on Brainly!
PS.: When you do give answer choices, I'll comeback and try my best to answer for you.
Answer:
Na₂O is the formula for the ionic compound "sodium oxide".
It has 2 sodium atoms and 1 oxygen atom.
The number of atoms for an element are written as a subscript after the element. "1" subscripts are not written.
The names of the elements are found on the periodic table.
Answer:
(Highest kinetic energy)
3. Neon at 65 K and 15 atm
2. Neon at 55 K and 10 atm
4. Neon at 25 K and 5 atm
1. Neon at 5 K and 0 atm
(Lowest kinetic energy)
Explanation:
In gases, <em>kinetic energy is higher the higher the temperature is</em>. This is because the molecules have more available energy under those conditions. <u>Generally there's also an increase in kinetic energy if there's an increase in pressure</u> -assuming there's no phase changes ie. the gas condenses into a liquid-.
Answer: The given statement is true.
Explanation:
Winter solstice is day at the hemispheres where day light is for shortest period and night longs for longest period. It is December 20 on northern hemisphere and 20 June on southern hemisphere.
During this time sun is farthest from the earth's both hemispheres.
Hence, the given statement is true.
Here’s what I found:
It takes very little energy to remove that outermost electron from an alkali metal. Thus, alkali metals easily lose their outermost electron to become a +1 ion. ... In fact, as you go down the 1A column, the first ionization energies get lower and lower, making cesium the most easily ionized element on the periodic table.
So basically it’s because part of what makes alkali metals so reactive is that they have one electron in their outermost electron layer.
