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4 years ago

Which element has four energy levels? Na,K,Cs,Rb

Chemistry

2 answers:

Ann [662]4 years ago

7 0

Potassium K

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Alik [6]4 years ago

6 0

Answer:

The correct option is: Potassium

Explanation:

Sodium, Potassium, Rubidium and Caesium are referred to as the alkali metals that belong to the group 1 of the periodic table, thus having one valence electron in their outer or valence shell.

Sodium, atomic number 11, belongs to the period 3 of the periodic table. It has three shells and the number of electrons per shell is 2, 8, 1.

Potassium, atomic number 19, belongs to the period 4 of the periodic table. It has four shells and the number of electrons per shell is 2, 8, 8, 1.

Rubidium, atomic number 37, belongs to the period 5 of the periodic table. It has five shells and the number of electrons per shell is 2, 8, 18, 8, 1.

Caesium, atomic number 37, belongs to the period 6 of the periodic table. It has six shells and the number of electrons per shell is 2, 8, 18, 18, 8, 1.

Therefore, Potassium, atomic number 19, has four shells or energy levels.

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Im not very good with science and i just need help with this assignment please

daser333 [38]

Answer:

Hey,

So what you would do here is first choose a biome, such as the desert for example, then choose an organism that lives there, or an animal. Then think of what it is like where it lives, is it dry, cold, windy, and so force, just describing the place by its looks and climate. How would this population increase, maybe it would be if there was suddenly more food there for them, or if their ecosystem got better for them to live, then, if they populated more, how would that affect the ecosystem. Maybe some animals would die off more, or some would have to much food. Like what if the fly population suddenly doubled, for example, how would that affect the ecosystem? Now what would happen if that organism was removed? If flies were removed, spiders and a lot of other organisms would not have food, and some organisms would overpopulate because nothing would eat them. That is just an example.

Explanation:

I hope this helps, sorry if not. Have a great day!

4 0

3 years ago

Read 2 more answers

Which type of species distribution pattern might require collaboration between different countries for effective preservation?

Zolol [24]

Answer:

migratory distribution

Explanation: The pattern of migratory distribution of species may require collaboration between different countries for effective preservation. This is because species migration can make them enter different territories, which will need to provide an effective level of preservation for species survival

4 0

3 years ago

Pls help me out!! lol

IceJOKER [234]

Answer:

when something is boiling. the temperature increases quickly so B and D are eliminated. So its either A or C. My guess is A

6 0

4 years ago

An element has an atomic number of 92 and a mass number of 234. how many neutrons does the element have? 192 142 92

GuDViN [60]

The atomic number of an element is characteristic to that element. Atomic number is the number of protons of that element.
Mass number is the sum of protons and neutrons of the element.
since protons and neutrons have a mass of 1 unit each, they together make up the mass of the element.
atomic number - number of protons - 92
mass number - number of neutrons + protons = 234
number of neutrons = mass number - atomic number
neutrons = 234 - 92 = 142
answer is 142

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3 years ago

When a paper towel absorbs water, is it a physical or chemical change?

Nonamiya [84]

Answer:

It is a physical change.

Explanation:

6 0

3 years ago