SCIENCE
CHEMISTRY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
4
|
|
|
8
|
|
|
2
|
|
|
16
|
Detailed explanation-1: -The element with atomic number 4 is beryllium, which means each atom of beryllium has 4 protons. A stable atom would have 4 neutrons and 4 electrons. Varying the number of neutrons changes the isotope of beryllium, while varying the number of electrons can make beryllium ions. The symbol for atomic number 4 is Be.
Detailed explanation-2: -Mass number of beryllium =4+5=9.
Detailed explanation-3: -Oxygen is a chemical element – a substance that contains only one type of atom. Its official chemical symbol is O, and its atomic number is 8, which means that an oxygen atom has eight protons in its nucleus.
Detailed explanation-4: -An atom with five protons and three neutrons in its nucleus would be known as boron-8, while an atom with four protons and four neutrons in its nucleus would be known as beryllium-8.