What is atoms and molecules class 9th?

What is atoms and molecules class 9th?

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 an atom Class 9 Ncert?

Answer: According to Thomson’s model of an atom. (i) An atom consists of a positively charged sphere and the electrons are embedded in it, (ii) The negative and positive charges are equal in magnitude. So the atom is electrically neutral. Question 2.

What is an atom Class 9 short answer?

An atom is the smallest component of an element and the building blocks of all matter, characterized by sharing of the chemical properties of the element and a nucleus with neutrons, protons, and electrons.

What is a molecule 9th?

A group of two or more than two atoms of the same or different elements that are chemically bonded together is called a molecule. For example: Two atoms of hydrogen (H2) and one atom of oxygen (O2) react with each other and form one molecule of water.

What are atom notes?

An atom consists of a central nucleus that is usually surrounded by one or more electrons. Each electron is negatively charged. The nucleus is positively charged, and contains one or more relatively heavy particles known as protons and neutrons. A proton is positively charged.

What is molecule answer?

Molecules are made up of one or more atoms. If they contain more than one atom, the atoms can be the same (an oxygen molecule has two oxygen atoms) or different (a water molecule has two hydrogen atoms and one oxygen atom). Biological molecules, such as proteins and DNA, can be made up of many thousands of atoms.

What is molecule in short answer?

Who found molecules?

In 1926, French physicist Jean Perrin received the Nobel Prize in physics for proving, conclusively, the existence of molecules.

What molecule has 9 carbon atoms?

hundreds place, the one in this example, represents the number of carbon atoms in the molecule. The tens place, the 0, represents the number of hydrogen atoms in the molecule, and the ones place represents the number of fluorine atoms in the molecule. According to the rule of 90, CFC-12 has 1 carbon atom, 0 hydrogen atoms, and 2 fluorine atoms.

What atom has the mass number 9?

Meanwhile, it’s mass number of 19, minus 10 neutrons, gives you 9 protons or electrons. Hence, the atom would be Fluorine. What is the mass number of an atom that contains 9 protons and 10 neutrons? For example, a fluorine atom has 9 protons and 10 neutrons. Its atomic number is 9, while its atomic mass is 19 atomic mass units.

How many atoms are in 9 mol of atoms?

There are 6.022 x 10^23 atoms in a mol. b. to find the number of atoms in 14.1 mol Li, multiply: 6.022 x 10^23 atoms/mol * 14.1 mol. The answer I get is 8.49 * 10^24 Li atoms. Source (s): I’m a chemistry tutor at my college. Before you spit any answers estimate what you think your answer should be.

What is molecule containing only two atoms?

Diatomic refers to a molecule containing only two atoms. Triatomic molecule a molecule containing three atoms. Ozone Ozone is an allotrope of oxygen containing three oxygen atoms. Polyatomic ion A polyatomic ion is an ion comprised of two or more atoms.