$CATEGORY: Science - TicTacLearn/4. Structure of the atom/4. Structure of the atom--The Structure of an Atom

//Multiple Choice

What is the main reason for the existence of different substances?
{
~The number of protons in an atom
=The atoms from which they are made
~The size of the atom
~The electrons in the atom
}

Which of the following is Thomson's atomic model compared to?
{
~A basketball
=A watermelon
~A peach
~A clock
}

What was the charge of the alpha particles used in Rutherford's experiment?
{
~Neutral
=Positively charged
~Negatively charged
~Doubly charged helium ions
}

According to Rutherford, the positive charge of the atom is concentrated in a small area called the\:
{
~Proton
~Electron cloud
=Nucleus
~Orbital
}

What was a major flaw of Rutherford’s atomic model?
{
~It did not explain the neutrality of atoms
=It could not explain why electrons do not radiate energy
~It could not explain the existence of neutrons
~It was too complex
}

Who proposed the Bohr model of the atom?
{
~Ernest Rutherford
=Niels Bohr
~J.J. Thomson
~E. Goldstein
}

In Bohr’s model, how are electron orbits represented?
{
~By letters K, L, M, N
~By numbers 1, 2, 3, 4
~By quantum numbers n = 1, 2, 3, 4
=All of the above
}

Who discovered the neutron?
{
~Albert Einstein
~Ernest Rutherford
~Niels Bohr
=James Chadwick
}

What is the charge of a neutron?
{
~Positive
~Negative
=No charge
~Variable charge
}

What is the mass of an atom primarily determined by?
{
~The mass of electrons
=The mass of protons and neutrons
~The number of protons
~The number of electrons
}

What happens to electrons in discrete orbits according to Bohr's model?
{
~They radiate energy
=They do not radiate energy
~They lose energy and spiral into the nucleus
~They randomly move around the atom
}


//True or False

An atom is indivisible and cannot be broken down into smaller parts.{F}

Rubbing two objects together, like a comb and dry hair, can cause them to become electrically charged.{T}

The proton has the same mass as an electron.{F}

J.J. Thomson proposed the idea that electrons are embedded in a positively charged sphere, like seeds in a watermelon.{T}

The nucleus of an atom contains the majority of its mass.{T}

In Rutherford's experiment, alpha particles were deflected at large angles because of the strong positive charge spread throughout the atom.{F}

The Bohr model of the atom states that electrons can be found in discrete orbits around the nucleus.{T}

The proton was discovered by Niels Bohr in 1886.{F}

Bohr’s model explains that electrons in the atom move in continuous orbits, radiating energy.{F}

In Rutherford’s atomic model, the electrons revolve around the nucleus in circular orbits.{T}

Neutrons are present in the nucleus of all atoms except hydrogen.{T}


//Match the Following

Match the following items from Column A with their correct corresponding options from Column B\:
{
=Bohr's Model -> discrete orbits around the nucleus
=Alpha Particles -> Used in Rutherford’s experiment
=Proton -> a positive charge
=Neutron -> Present in the nucleus of all atoms except hydrogen
=Electron -> The charge is negative
}

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