Aufbau says that the sublevels fill 1s2, 2s2, 2p6. That would mean that you must have filled 1 and 2 s (=4) and 3 more. Last I checked, 3 + 4 = 7. Which element has 7 electrons? I'll give you a hint: its atomic number is 7. Another hint: its symbol is N.
To find the element with a 3p4 valence configuration, look in period 3 and group XVI, and that is ...S, sulfur.
Carbon. It has 2 electrons in its 1s orbital and 4 electrons in its 2s orbital.
Argon is the last element in its period (period 3) because it fills the 3p sublevel, which can hold a maximum of six electrons. After argon, the next element, potassium, begins filling the 4s sublevel in the next period (period 4).
The 4f sublevel can hold a maximum of 14 electrons.
CARBON
Selenium or Se
Aufbau says that the sublevels fill 1s2, 2s2, 2p6. That would mean that you must have filled 1 and 2 s (=4) and 3 more. Last I checked, 3 + 4 = 7. Which element has 7 electrons? I'll give you a hint: its atomic number is 7. Another hint: its symbol is N.
To find the element with a 3p4 valence configuration, look in period 3 and group XVI, and that is ...S, sulfur.
Carbon. It has 2 electrons in its 1s orbital and 4 electrons in its 2s orbital.
Argon is the last element in its period (period 3) because it fills the 3p sublevel, which can hold a maximum of six electrons. After argon, the next element, potassium, begins filling the 4s sublevel in the next period (period 4).
The 4f sublevel can hold a maximum of 14 electrons.
Calcium has 20 electrons, which are distributed in 4 electron orbitals: 1s, 2s, 2p, and 3s. Each orbital can hold a specific number of electrons based on its shape and energy level.
The electron configuration indicates that the element ne3s2 3p4 belongs to the p-block in period 3 of the periodic table. It is specifically in group 16 (also known as group VI-A or 6A), which includes elements such as oxygen and sulfur.
The 4p sublevel can hold a maximum of 6 electrons. Each p orbital within the 4p sublevel can hold up to 2 electrons, and there are 3 p orbitals in the 4p sublevel (2 electrons per orbital * 3 orbitals = 6 electrons).
That varies, element #3 will have 3, element 4 will have 4, etc. However, they all have 2 valence electrons.
The electron structure given is 1s2 2s2 2p6 3s2 3p2. Adding up the electrons in each level gives 2 + 2 + 6 + 2 + 2 = 14 electrons. The third principal energy level corresponds to n=3, so the number of electrons in the third level is 2 + 2 + 6 = 10.