The Guys
Which of the following was one of Dalton's ideas? a: All substances are made of atoms B: Atoms can be divided C: Atoms can be destroyed d: some substances are made of atoms
A: All substances are made of atoms
The number of protons in an atom of an element is its
atomic number
Neutron is _______ charged
un (charged) / neutrally
Define the term isotope.
Atoms of the same element with different mass numbers due to different numbers of neutrons (but the same number of protons).
Why can you never trust an atom 🤣?
They make up everything!
What structure did Rutherford discover was in an atom after his gold foil experiment?
A nucleus
The positively charged particle
A proton
Electrons are _____ charged.
negatively
What particle lives in the rings of a Bohr model diagram?
electrons
A beta particle is released when a ______ from an unstable nuclei is converted into a _______ and a/an __________.
proton, neutron and an electron
OR
proton, electron and neutron.
What particle did J.J. Thomson discover?
electron
The total mass and volume of an atom is mainly in this part of the atom.
nucleus
An atom with a mass number of 41 and an atomic number of 19 has ___ protons and _____ neutrons.
19 protons, 22 neutrons
A (n) _____ is a very small particle that is the basic unit of matter.
atom
80g of a radioactive sample becomes 10g after 21 days. What is the samples half-life? _____ days
7 days
The plums in Thomson's plum-pudding model of the atom represent:
electrons
In an atom, which has the least mass? A: nucleus B: proton C: neutron D: electron
electron
Which element is found in Group 2, Period 4 of the Periodic Table?
Calcium
Electrons in an atom move throughout the _____ surrounding the nucleus.
shells, orbitals, energy levels
An experiment was done to test the effect of hydrogen peroxide on the texture of meat.
What is the dependent variable?
texture of meat
What did Bohr, Democritus, Thomson, Dalton, and Rutherford all have in common? A: They each identified the electromagnetic force of atoms B: They each identified new electron clouds C: They each developed ideas about atoms D: They each conducted experiments with ions
C: They each developed ideas about atoms
Describe the difference between atomic number and mass number *Multiple sentence answer*
The atomic number is the number of proton in an atom. The Mass number is the sum of the number of protons and neutrons in an atom of a particular isotope
The most dense structure in an atom called the _______ and it is made up of ______ and ______.
nucleus, protons, neutrons
OR
nucleus, neutrons, protons
An atom is electrically neutral (neutrally charged) because
the numbers of protons and electrons are equal.
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