A molecule is the smallest thing a substance can be divided into while remaining the same substance . It is made up of two or more atoms that are bound together by chemical bonding.
What is atoms and molecules Class 9?
Define atom. Answer: The smallest particle of matter , which can take part in a chemical reaction is called atom. Question 5. Define molecule. Answer: The smallest particle of an element or compound which can exist independently is called molecule.
What is a molecule short answer?
A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms.
What is molecule in biology?
(biology or biochemistry) An extremely small particle or substance , especially at cellular or structural level, as a biomolecule. (physics and chemistry) The smallest unit of an element or compound, made up of two or more atoms held together by strong chemical bond. Supplement.
What is molecule define with example?
A molecule is a particle made up of two or more atoms that are chemically bonded together ; the number of atomic nuclei making up a molecule is a determinate number. For example, HCl ( g ) is a molecule made of one hydrogen atom bonded to one chlorine atom. ... It contains three atoms and is called a triatomic molecule.
What is called molecule?
molecule, a group of two or more atoms that form the smallest identifiable unit into which a pure substance can be divided and still retain the composition and chemical properties of that substance.
What are the 2 types of molecules?
- Diatomic Molecules — A diatomic atom is composed of only two atoms, of the same or different chemical elements. ...
- Heteronuclear Diatomic Molecules — A heteronuclear diatomic molecule consists of two of atoms of the same element combined. ...
- OXYGEN MOLECULE.
- CARBON MONOXIDE MOLECULE (CO)
How is an atom formed?
Atoms are made up of a nucleus, protons and electrons. ... Atoms were created after the Big Bang 13.7 billion years ago . As the hot, dense new universe cooled, conditions became suitable for quarks and electrons to form. Quarks came together to form protons and neutrons, and these particles combined into nuclei.
Can an atom be a molecule?
Elements can be made of one atom , like He, or be elemental molecules, such as hydrogen (H 2 ), oxygen (O 2 ), chlorine (Cl 2 ), ozone (O 3 ), and sulfur (S 8 ). Atoms are not drawn to scale. Some elements are monatomic, meaning they are made of a single (mon-) atom (-atomic) in their molecular form. Helium (He, see Fig.
What is Valency class 9th?
The combining capacity of an atom of an element to form chemical bond is called its valency. The valency of an element is. (1) Equal to the number of valence electrons . (2) Equal to the number of electrons required to complete eight electrons in valence shell.
What are 3 types of molecules?
There are three types of molecules which are the element molecule, the compound molecule & the mixture .
What is an atom vs molecule?
Atoms are single neutral particles . Molecules are neutral particles made of two or more atoms bonded together.
What is organism mean in science?
An organism is an individual form of life that is capable of growing and reproducing, and have one or more cells . Animals, plants and bacterium are all organisms. All of these cells come from pre-existing cells, and multi-cellular organisms have specific cells for different functions.
What are 2 examples of compounds?
Examples of compounds include table salt or sodium chloride (NaCl, an ionic compound), sucrose (a molecule), nitrogen gas (N 2 , a covalent molecule), a sample of copper (intermetallic), and water (H 2 O, a covalent molecule).
How do you identify a molecule?
Using the VSEPR theory, the electron bond pairs and lone pairs on the center atom will help us predict the shape of a molecule. The shape of a molecule is determined by the location of the nuclei and its electrons . The electrons and the nuclei settle into positions that minimize repulsion and maximize attraction.
How many molecules are there?
The mole allows scientists to calculate the number of elementary entities (usually atoms or molecules ) in a certain mass of a given substance. Avogadro’s number is an absolute number: there are 6.022×10 23 elementary entities in 1 mole . This can also be written as 6.022×10 23 mol – 1 .
