30 Questions
Who is credited with explaining the nature of matter and proposing that all substances are made up of atoms?
Democritus
Which scientist proposed the concept that atoms are indivisible?
John Dalton
What did Democritus propose about atoms?
Atoms are indivisible
What did John Dalton propose about elements?
Elements are composed of atoms
According to the atomic theory proposed by Dalton, how are atoms involved in a chemical reaction?
Atoms rearrange or combine
Which scientist was NOT mentioned as having proposed concepts related to the atom by the early 20th century?
Democritus
Who discovered the nucleus of an atom through the alpha scattering experiment?
Ernest Rutherford
What did Ernest Rutherford call the positively charged particles concentrated in the nucleus?
Protons
How did James Chadwick contribute to our understanding of atomic structure?
He discovered neutrons
What was the major problem left unsolved by Rutherford's atomic model?
The ratio of helium to hydrogen atom mass
What is the mass ratio between a neutron and a proton?
Equal masses
Which English physicist provided evidence for the existence of neutrons in the nucleus?
James Chadwick
What is the actual mass of a neutron in grams?
1.67 x 10^-24
Where are electrons primarily located within an atom?
Outside the nucleus
Which subatomic particle contributes to stabilizing the nucleic charge of the atom?
Electrons
What is the primary role of the atomic number of an element?
Describing the total number of protons in its nucleus
Which particles make up the nucleus of an atom?
Neutrons and protons
What provides insight into chemical reactions, bonds, and physical properties of elements?
'Atomic structure'
What makes an atom electrically neutral?
Equal number of protons and electrons
During absorption, what happens to an electron?
It absorbs energy and moves to a higher energy level
Which model suggested that electrons move around the nucleus in definite orbits or energy levels?
Bohr's model
What determines the maximum number of electrons each orbit can hold?
Energy level of the orbit
Which concept outlines the electrical interaction between atoms?
Chemical bonding
In chemical bonding, what are formed by the electrical tendencies of electrons between atoms?
Bonds
What happens when electrons jump from higher to lower orbits?
They release energy as light
What is a limitation of Bohr's model related to spectral lines?
Unable to predict relative intensities of spectral lines
Why does Bohr's model fail to account for accelerating electrons emitting electromagnetic radiation?
Incorrectly assumes electrons are stationary
What is a fundamental flaw in Bohr's model regarding electron movement?
It assumes electrons move in fixed orbits
What aspect of atomic theory was postulated by Bohr's model?
Quantization of electron orbits
Which scientist developed the idea of discreet energies for electromagnetic radiation?
Max Planck
Learn about the basic concept of an atom as the fundamental building block of matter. Explore how atoms form the basis of everything we see around us, from living organisms to non-living objects. Discover the history and significance of atoms according to Greek philosophers.
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