
Elements and atomic number (video) | Khan Academy
And here's another example, iron, its atomic number is 26, so every iron atom has 26 protons. An element's atomic number can also tell us the number of electrons in a neutral atom of an element.
Atomic number, atomic mass, and isotopes (article) | Khan Academy
Fundamental properties of atoms including atomic number and atomic mass. The atomic number is the number of protons in an atom, and isotopes have the same atomic number but differ in the number of …
Given atomic number find position and vice-versa (Solved example ...
If you are given with the atomic number of an element you can find it's period number and group number. The period number is related to the number of electron occupied shells in the element and …
Atomic number, mass number, and isotopes - Khan Academy
Each atom has a charged sub-structure consisting of a nucleus, which is made of protons and neutrons, surrounded by electrons. The number of protons and the mass number of an atom define the type of …
Worked example: Identifying isotopes and ions - Khan Academy
Identifying isotopes and ions from the number of electrons, protons and neutrons, and vice versa.
Worked example: using the mass number equation - Khan Academy
We can look up platinum on the periodic table to find its atomic number, which is 78, meaning that every platinum atom has 78 protons. We can subtract the atomic number 78 from the mass number 195 to …
The periodic table, electron shells, and orbitals - Khan Academy
Elements are placed in order on the periodic table based on their atomic number, how many protons they have. In a neutral atom, the number of electrons will equal the number of protons, so we can …
हल किए गए उदाहरण: समस्थानिकों और आयनों की पहचान …
हल किए गए उदाहरण: समस्थानिकों और आयनों की पहचान करना परमाणु संख्या (Atomic number) तथा द्रव्यमान संख्या (mass number) समस्थानिक (Isotopes) और समभारिक …
Elements, atoms, and the periodic table (article) | Khan Academy
Every element has its own unique number, similar to an “ID number.” This value is known as the atomic number and is what we use to arrange the elements on the periodic table.
Average atomic mass (video) | Khan Academy
★ The number under the elements in the periodic table (for example, the "1.008" in Hydrogen) is the "aam", or average atomic mass. Average atomic mass - weighted average of various versions of the …