Check answers?
1) Why did J.J. Thomson reason that electrons must be a part of the atoms of all elements?
A) Cathode rays are negatively charged particles****
B) Cathode rays can be deflected by magnets
C) An electron is 2000 times lighter than a hydrogen atom
D) Charge-to-mass ratio of electrons was the same, regardless of the gas used
2) Who conducted experiments to determine the quantity of charge carried by an electron?
A) Rutherford
B) Millikan
C) Dalton****
D) Thomson
3) What is the relative mass of an electron?
A) 1/1840 the mass of a hydrogen atom
B) 1/1840 the mass of a neutron + proton***
C) 1/1840 the mass of a C-12 atom
D)1/1840 the mass of an alpha particle
4) All stable atoms are ____.
A) positively charged, with the number of protons exceeding the number of electrons
B) negatively charged, with the number of electrons exceeding the number of protons
C) neutral, with the number of protons equaling the number of electrons
D) neutral, with the number of protons equaling the number of electrons, which is equal to the number of neutrons*****
1. D
2. B
3. A
4. C
D b a c ya heard!
They're correct ^^
The very first one with the answers are incorrect.
To check the answers, let's analyze each question and its options:
1) Why did J.J. Thomson reason that electrons must be a part of the atoms of all elements?
A) Cathode rays are negatively charged particles
B) Cathode rays can be deflected by magnets
C) An electron is 2000 times lighter than a hydrogen atom
D) Charge-to-mass ratio of electrons was the same, regardless of the gas used
The correct answer is A) Cathode rays are negatively charged particles.
J.J. Thomson reasoned that electrons must be a part of atoms of all elements because cathode rays, which were a stream of particles emitted in a cathode ray tube, were observed to carry a negative charge. This led Thomson to conclude that atoms contain negatively charged electrons.
2) Who conducted experiments to determine the quantity of charge carried by an electron?
A) Rutherford
B) Millikan
C) Dalton
D) Thomson
The correct answer is B) Millikan.
Robert Millikan conducted the oil drop experiment to determine the quantity of charge carried by an electron. This experiment involved observing the motion of oil droplets in an electric field and calculating the charge on each droplet.
3) What is the relative mass of an electron?
A) 1/1840 the mass of a hydrogen atom
B) 1/1840 the mass of a neutron + proton
C) 1/1840 the mass of a C-12 atom
D) 1/1840 the mass of an alpha particle
The correct answer is A) 1/1840 the mass of a hydrogen atom.
The relative mass of an electron is approximately 1/1840 the mass of a hydrogen atom. This means that electrons are much lighter than atoms, such as hydrogen, which have similar atomic numbers.
4) All stable atoms are ____.
A) positively charged, with the number of protons exceeding the number of electrons
B) negatively charged, with the number of electrons exceeding the number of protons
C) neutral, with the number of protons equaling the number of electrons
D) neutral, with the number of protons equaling the number of electrons, which is equal to the number of neutrons
The correct answer is C) neutral, with the number of protons equaling the number of electrons.
All stable atoms are neutral, meaning they have an equal number of protons and electrons. This balance of positive and negative charges results in a net charge of zero for the atom.
a,b,c,d
72
All of the answers for 1 are true but I don't think A is the best one.
2,3,4 are not right.