The electronic configuration of an element X is:
1s² 2s² 2p6 3s2 3p5
Deduce the atomic number of X
To what group does it belong
Give two properties of the group to which the element X belong.
Identify element X by name.
Write a balanced equation to represent the reaction between the element X and hot concentrated NaOH?
Yes
Correct answer
To deduce the atomic number of element X, we need to understand the electronic configuration notation. Each digit in the configuration represents the number of electrons in that specific energy level or orbital. Let's break down the electronic configuration for element X:
1s² 2s² 2p6 3s2 3p5
Starting with the first number, we see that there are 2 electrons in the 1s orbital. Moving on to the next number, we have 2s², indicating 2 electrons in the 2s orbital. The next number is 2p6, which represents 6 electrons in the 2p orbital. Continuing, we have 3s², which signifies 2 electrons in the 3s orbital. Finally, we have 3p5, indicating 5 electrons in the 3p orbital.
To determine the total number of electrons, we add up the numbers: 2 + 2 + 6 + 2 + 5 = 17. Therefore, element X has 17 electrons.
The atomic number of an element is equal to the number of protons in the nucleus. Since an atom is neutral, the number of protons is also equal to the number of electrons. Thus, the atomic number of element X is 17.
To find the group to which element X belongs, we need to consider the outermost energy level. In this case, it is the 3rd energy level with 2 electrons in the 3s orbital and 5 electrons in the 3p orbital. The sum of these electrons is 7, indicating that element X belongs to Group 17 of the periodic table, commonly known as the Halogens.
Properties of the Halogens (Group 17):
1. High electronegativity: Elements in Group 17 tend to have a strong attraction for electrons, making them highly electronegative.
2. High reactivity: Halogens readily react with other elements to gain electrons and form stable compounds. They are strong oxidizing agents.
To identify the element X by name, we refer to the periodic table. Element with the atomic number 17 is Chlorine (Cl).
Finally, let's write a balanced equation to represent the reaction between Chlorine (X) and hot concentrated Sodium Hydroxide (NaOH):
2NaOH + Cl₂ → NaCl + H₂O