Question

Write the Atomic number, atomic mass number and electronic configuration of the following elements.
1. Bromine
2. Fluorine
3. Potassium​

Answer 1

Answer:

Atoms of each element contain a characteristic number of protons. In fact, the number of protons determines what atom we are looking at (e.g., all atoms with six protons are carbon atoms); the number of protons in an atom is called the atomic number. In contrast, the number of neutrons for a given element can vary. Forms of the same atom that differ only in their number of neutrons are called isotopes. Together, the number of protons and the number of neutrons determine an element’s mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.

Fluorine (F) is the first element in the Halogen group (group 17) in the periodic table. Its atomic number is 9 and its atomic weight is 19, and it's a gas at room temperature. It is the most electronegative element, given that it is the top element in the Halogen Group, and therefore is very reactive. It is a nonmetal, and is one of the few elements that can form diatomic molecules (F2). It has 5 valence electrons in the 2p level. Its electron configuration is 1s22s22p5. It will usually form the anion F- since it is extremely electronegative and a strong oxidizing agent. Fluorine is a Lewis acid in weak acid, which means that it accepts electrons when reacting. Fluorine has many isotopes, but the only stable one found in nature is F-19.

Answer 2

Explanation:

1.Bromine

Atomic number :- 35

Atomic mass number :- 79.904

Electronic configuration :- 2,8,8,8,8,1

Symbol :- Br

2.Fluorine

Atomic number:- 9

Atomic mass number :-18.998

Electronic configuration :- 2,7.

Symbol:- F

3. Potassium

Atomic number:- 19

Atomic mass number :- 39.098

Electronic configuration:- 2,8,8,1

Symbol :- K