Atomic Structure (Grade 8)
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A negatively charged particle moving around the nucleus of an atom
A positively charged particle in the nucleus of an atom
Why does an atom have no net electric charge?
- Its subatomic particles carry no electrical charge.
- The positively charged protons cancel out the negatively charged neutrons.
- The positively charged neutrons cancel out the negatively charged electrons.
- The positively charged protons cancel out the negatively charged electrons.
What is an isotope
- An element with equal number of protons and neutrons
- An elements with differing numbers of protons and electrons
- An element with differing number of protons and neutrons
- An element with equal number of protons and electrons
Compared to the charge and mass of a proton, an electron has
- the same charge and a smaller mass
- the same charge and the same mass
- opposite charge and smaller mass
- opposite charge and the same mass
A proton has approximately the same mass as
- a neutron
- a beta particle
- an alpha particle
- an electron
The electron cloud is a visual model of the probable locations of electrons in an atom.
What is the nucleus made of?
- protons and electrons
- protons and neutrons
- electrons and neutrons
Neutrons are found in the rings around the Bohr-Rutherford diagram.
If atoms of a halogen nonmetal (Group 17) gain one electron, the atoms then have
- no valence electrons
- 7 valence electrons
- 8 valence electrons
- 17 valence electrons