1. Which of the following isn't electrically neutral?
A. Neutron
B. Atom C. Molecule
D. P...
Chemistry, 24.11.2020 14:00 blackchina71
1. Which of the following isn't electrically neutral?
A. Neutron
B. Atom C. Molecule
D. Proton
2. Which of the following element has no neutron partied particle?
A. Hydrogen B. Helium
C. Lithium
D. Sodium
3. Which one of the following is the heaviest sub-atomic particle?
A. Electron B. Helium
C Proton
D. Ion
4. The nucleus of an atom is positively charged due to
A. electrons b. neutrons C. proton D. Ion
5. The atomic nucleus consists of
and
particles
A. electron and proton
C. proton and electron
B. neutron and electron D. Proton and neutron
6. The first Greek philosopher who proposed the concept of an atom was
A. Dalton
C. Robert Boyle
B. Aristotle
D. Democritus
Answers: 2
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Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.
Answers: 3
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