7. What do you run 8. What is the difference between 20 and O2 ? 9. What is a radical ? 10. Differentiate between a cation and an anion. 11. State main postulates of Dalton's atomic theory. 12. Explain the modern system of naming elements by th 13. What is variable valency ? Explain giving examples.
Answers
Answer:
7 People start running for a variety of reasons. Some run because they want to lose weight, improve their health, compete in races, or try something new. Whatever your reason is for running, you'll experience many physical, mental, and emotional benefits of the sport. Here are some great reasons to start running.
8. The key difference between 2O and O2 is that 2O refers to two free oxygen atoms, whereas O2 refers to a molecule having two oxygen atoms. ... Both terms mean that there are two oxygen atoms. But, the difference between 2O and O2 is the state of these oxygen atoms – whether they are free or bound to each other.
9 In mathematics, an nth root of a number x is a number r which, when raised to the power n, yields x: {\displaystyle r^{n}=x, } where n is a positive integer, sometimes called the degree of the root. A root of degree 2 is called a square root and a root of degree 3, a cube root.
10. An ion or a charged particle which has a positive charge is called cation. An ion or a charged particle which has a negative charge is called anion. ... In anions the number of electrons is more than the number of protons.
11. The main postulates of Dalton's atomic theory are:
The matter is made up of indivisible particles known as atoms.
The properties of all the atoms of a given element are the same including mass. ...
Atoms of different elements combine in fixed ratios to form compounds.
Atoms are neither created nor destroyed.
12. Berzelius was also a pioneer of chemical nomenclature and introduced the familiar one- and two-letter symbols for the chemical elements based on their Latin names (some of which he had to devise himself).
13. Certain elements combine with other atoms, donating, accepting or sharing electrons in different proportions depending on the nature of the reaction. For example, iron combines with oxygen to form ferrous oxide as well as ferric oxide. This is termed variable valency.
Answer:
cation is a postively charged ion. Anion is a negatively charged ion
Explanation: