Subatomic
Particles
Particles
What subatomic particle has a positive charge?
proton
What is the atomic number of hydrogen?
1
how many electrons can one s orbital hold?
2
what group in the periodic table contains noble gases?
group 18
what is the isotope of carbon with 6 protons and 8 neutrons called?
carbon-14
What is the charge of a neutron?
neutral
What is the atomic mass of carbon?
12amu
1s2 2s2 2p4
Name the Alkaline Earth Metal found in period 3.
Magnesium
Define Isotopes
Atoms of the same element with a different number of neutrons.
What is the mass of a proton compared to a neutron?
Approximately the same; both are about 1 amu.
What does the atomic number represent and tell us?
The number of protons in an element and the identity of an element.
What is the maximum number of valence electrons in the lewis structure of an atom, and what is the rule called?
8(octet rule)
Which group contains the Halogens?
Group 17
How does the relative atomic mass of an element relate to its isotopes?
It is the weighted average of the masses of its isotopes.
What determines the identity of an element at the atomic level?
The number of protons in the nucleus determines the element's identity.
How do the atomic radii of elements change across a period and down a group in the periodic table?
Atomic radii decrease across a period (left to right) due to increased nuclear charge and increase down a group due to additional electron shells.
Write the noble gas configuration for xenon (Xe).
[Kr] 5s² 4d¹⁰ 5p⁶ or [Xe]
Why do elements in the same group have similar chemical properties?
They have the same number of valence electrons.
What is the difference between the mass number and atomic number of an isotope?
The mass number is the total number of protons and neutrons, while the atomic number is the number of protons.