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Author: Admin | 2025-04-28
Number of protons in the nucleus of an atom of that element. If you are not able to see in the below picture, then zoom it.You can confirm the atomic number of an element based on nearby the atomic number of elements. This is because the elements in the periodic table are arranged in increasing order of the atomic number. This sequential order helps in determining the atomic number of an element based on its neighboring elements.For example, if you want to find out the atomic number of carbon element which is 6, then the element to the left should be boron whose atomic number is 5 and the element to the right should have nitrogen whose atomic number is 7. If this pattern holds true, you’ve correctly identified the atomic number of the element.(2) Using Formula:The atomic number (Z) is simply the number of protons in an atom of the element.Z = number of protons.(3) For Neutral Atoms:The atomic number also tells you the number of electrons in a neutral atom.In a neutral atom, number of electrons = number of proton.Examples of Finding Atomic NumbersExample 1: Hydrogen (H)Step 1: Look up hydrogen in the periodic table. You will find that its atomic number is 1.Step 2: This means that every atom of hydrogen has exactly 1 proton in its nucleus.Step 3: Since hydrogen is neutral, it also has 1 electron.Example 2: Carbon (C)Step 1: Find carbon element on the periodic table. You will see that its atomic number is 6.Step 2: This means that every carbon atom has 6 protons in its nucleus.Step 3: In a neutral carbon atom, there are 6 electrons which orbits around the nucleus in different energy levels or orbits.Example 3: Oxygen (O)Step 1: Locate oxygen element in the periodic table. You will see that its atomic number is 8 in the above periodic table.Step 2: This means that each oxygen atom contains 8 protons in its nucleus.Step 3: In a neutral oxygen atom, there are also 8 electrons which revolves around the nucleus in different energy levels or orbits.Atomic Number vs. Mass NumberThe atomic number (Z) tells us the number of protons present in the nucleus of an atom, while the mass number (A) tells us the total number of protons and neutrons present in the nucleus of an atom. The mass number is used to calculate the atomic mass of an element.Mass Number (A) = Number of Protons (Z) + Number of Neutrons (n)Unlike the atomic number, the mass number can vary between atoms of the same element because of isotopes, which have different numbers of neutrons.Key Points about ZAtomic number is the number of protons present in an atom’s nucleus.It is represented by the letter Z.Every element has a unique atomic number.All the atoms of a specific element have the same number of protons. Therefore, Z is also the same. For example, all boron atoms have the atomic number of 5, whereas all atoms of carbon atoms have 6 protons in their
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