arsenic
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.
An element cannot have 4 electrons in the 2 s level. The s subshell can hold only TWO electrons. Carbon has 4 electrons in the 2p level, however, if that's what you meant.
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 elements in period 4 that have electrons in the 3d sublevel are elements 21 - 36. Refer to the Related Links for a printable periodic table that includes electron configurations.
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.
The element in Period 4 that has two electrons in the p sublevel is germanium (Ge). It has the atomic number 32 and is located in group 14 of the periodic table. In its electron configuration, germanium has the outermost electrons in the 4s and 4p sublevels, with the 4p sublevel containing two electrons.
To find the element with a 3p4 valence configuration, look in period 3 and group XVI, and that is ...S, sulfur.
An element cannot have 4 electrons in the 2 s level. The s subshell can hold only TWO electrons. Carbon has 4 electrons in the 2p level, however, if that's what you meant.
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 elements in period 4 that have electrons in the 3d sublevel are elements 21 - 36. Refer to the Related Links for a printable periodic table that includes electron configurations.
Zero. Calcium has two electrons in its 4s sublevel, and none in the 3d sublevel. The 3d sublevel doesn't start filling until after the 4s sublevel is filled.
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).
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.
That varies, element #3 will have 3, element 4 will have 4, etc. However, they all have 2 valence electrons.