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

Answers

Answer 1

Answer:

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.

Answer 2

Answer:

Among the given options, the element that has four energy levels is potassium (K). The correct answer is option 2.

An energy level is a specific amount of energy that an electron in an atom can possess.

The electronic configurations of Na (sodium), K (potassium), Cs (cesium), and Rb (rubidium) are as follows:

Na: $\rm 1s^2 2s^2 2p^6 3s^1$

K: $\rm 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1$

Cs: $\rm 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^(10)4p^6 5s^2 4d^(10) 5p^6 6s^1$

Rb: $\rm 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^(10) 4p^6 5s^1$

The above electronic configurations shows that only Potassium has 4 energy levels while Na has 3 energy levels, Cs has 6 energy levels and Rb has 5 energy levels.

Therefore, the correct answer is option 2. Potassium (K) has four energy levels.

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i have no idea.. im not in chemistry yet.. but i think the first one is D

2H₂O ----> 2H₂ + O₂How many moles of hydrogen are produced when 6.28 mol of oxygen form?

A.) 3.14 mol
B.) 6.28 mol
C.) 12.6 mol
D.) 25.2 mol

Answers

2 H2O ------------> 2 H2 + 1 O2

2 mol H2 ----> 1 mol O2
x mol H2 -----> 6.28 mol O2

x = 6.28 * 2

x ≈ 12.6 mol

answer C

hope this helps!.

6.28 mol O2* (2 mol H2/ 1 mol O2)= 12.6 mol H2

The correct answer is C. 12.6 mol~

Atomic emission spectra are produced when the light emitted by an element passes through a prism. Which of the following statements is true regarding these spectra?A. All elements produce the same atomic spectra.
B. Elements produce continuous spectra.
C. Elements produce spectra with only a few distinct lines.

Answers

Option C: elements produce spectra with only few distinct lines.

The spectra are not continuos and are different for every element. This permits to identify elements.

Final answer:

Atomic emission spectra are unique to each element and consist of distinct lines representing different energy levels.

Explanation:

The correct statement regarding atomic emission spectra is option C: Elements produce spectra with only a few distinct lines.

The spectra produced by different elements are unique to each element, meaning that they have distinct patterns of lines.
These lines represent the different energy levels that electrons can occupy within the atom.
The specific pattern of lines in an atomic emission spectrum can be used to identify the element present in a sample of unknown composition.

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