1. State five main assumptions of Dalton's atomic
2. Name the nucleons present within the nucleus of
an atom and state their mass and charge.
3. What do you understand by the following terms:
(a) atomic number, (b) mass number?
4. State any four observations made by Rutherford,
5. What are (a) bound electrons (b) valence
7. State any three conclusions regarding the nucleus
electrons ?
of an atom.
in bombarding gold foil with alpha particles.
6. How is an atom electrically stable?
Answers
Answer:
Hey buddy, here is your answer!
Explanation:
1.The five main assumptions of Dalton were:
•All matter is made up of tiny, indivisible particles called atoms.
•All atoms of a specific element are identical in mass, size, and other properties. However, atoms of different element exhibit different properties and vary in mass and size.
•Atoms can neither be created nor destroyed. Furthermore, atoms cannot be divided into smaller particles.
•Atoms of different elements can combine with each other in fixed whole-number ratios in order to form compounds.
•Atoms can be rearranged, combined, or separated in chemical reactions.
2.Nucelons present in an atom are protons and neutrons.
Protons -- relative charge +1 and mass is 1.6725*10^-27
Neutrons -- relative charge 0 and mass is 1.648*10^-27
3.Atomic number: The total number of protons in the nucleus of an atom gives us the atomic number of that atom.
It is represented with the letter ‘Z.’
Mass number: The number of protons and neutrons combined to give us the mass number of an atom.
It is represented using the letter ‘A.’
4.
1.most of the alpha particles passes straight through the gold foil.
conclusion:most of the space inside the atom is empty.
2.some of the alpha particles got reflected through small angles.
conclusion:this shows that the centre of the atom is positively charged
3.a very few alpha particles bounced back completely on hitting the gold foil
conclusion:this shows that the positively charged centre is very dense hard and small which does not allow the alpha particles to pass through it
5. A bound electron is one that is still considered part of the atom and is attracted to the nucleus whereas a free electron is one that absorbed enough energy from photons to completely leave the atom.
Electron of an atom, located in the outermost shell (valence shell ) of the atom, that can be transferred to or shared with another atom.
6. An atom has equal number of protons and electrons in its ground state. This makes the atom neutral and thus electrically stable.
7. Have answered it in the answer of 4th question itself.
Answer:
heres what i knew about it
Explanation:
All matter is made of atoms. Atoms are indivisible and indestructible.
All atoms of a given element are identical in mass and properties.
Compounds are formed by a combination of two or more different kinds of atoms.
A chemical reaction is a rearrangement of atoms.