Electron configuration
What is the electron configuration of hydrogen (1)?
1s¹
Which element has the configuration 1s¹?
Hydrogen
What is the lowest possible energy state of an electron called?
Ground state
What is the maximum number of electrons in the first energy level?
2 electrons
What are the vertical columns on the periodic table called?
Groups
What is the electron configuration of helium (2)
1s²
Which element has the configuration 1s² 2s²?
Beryllium
What happens when an electron absorbs energy?
It moves to a higher energy level (excited state).
How many electrons can an s orbital hold?
2 electrons
What are the horizontal rows on the periodic table called?
Periods
What is the electron configuration of carbon (6)?
1s² 2s² 2p²
Which element has the configuration 1s² 2s² 2p⁶?
Neon
What happens when an excited electron releases energy?
It falls to a lower energy level and releases energy, often as light.
What is the maximum number of electrons in the third energy level?
18 electrons
What group number are the alkali metals in?
Group 1
What is the electron configuration of oxygen (8)?
1s² 2s² 2p⁴
Which element has the configuration 1s² 2s² 2p⁶ 3s²?
Magnesium
Is an electron in the configuration 1s² 2s¹ 2p¹ in an excited state for carbon?
Yes. One electron has moved from 2s to the higher-energy 2p orbital.
What is the maximum number of electrons in the 4th energy level?
32 electrons
An element is in Period 3 and Group 17. How many electron shells and valence electrons does it have?
3 electron shells and 7 valence electrons
What is the electron configuration of calcium (20)?
1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
Which element has the configuration 1s² 2s² 2p⁶ 3s² 3p⁵?
Chlorine
What is the difference between an excited state and a ground state?
Ground state is the lowest-energy arrangement; excited state has one or more electrons in higher-energy orbitals.
What is the maximum number of electrons in the 6th energy level?
32 electrons
What group has 2 valence electrons?
Group 2