Ok if you look at the Periodic Table Se is in 3P4. So you know that P can hold up to 6 electrons. In your mind picture three boxes and each box holds two electrons, But since you have certain rules you must put the electrons across before you can pair them up. So 1 goes into box one, another in box two, another in box three, now that the three boxes have something inside you go back to the first box and place the last electron, Notice you have two electrons without a partner. SO THE ANSWER IS 2.
Also you can also think of a bus... when you walk into a bus everyone wants to grab a seat by themselves right? once the next group of kids come and there are no longer any single seats than they start to sit next to other kids. Its the same idea with electrons. they all want their own seats until there is no single seats left then they pair up
Se is paramagnetic because it has unpaired electrons
three unpaired electrons
Germanium has 4 unpaired electrons.
There are three unpaired electrons in an arsenic atom. Arsenic has five valence electrons, with two paired and three unpaired electrons.
6 unpaired electrons
Se is paramagnetic because it has unpaired electrons
There are no unpaired electrons in strontium.
three unpaired electrons
Aluminum has three unpaired electrons.
Germanium has 4 unpaired electrons.
There are three unpaired electrons in an arsenic atom. Arsenic has five valence electrons, with two paired and three unpaired electrons.
6 unpaired electrons
Phosphorus has three unpaired electrons in its ground state.
Nickel has two unpaired electrons.
Xenon has eight unpaired electrons.
Neodymium (Nd) has 3 unpaired electrons.
Titanium (Ti) has four unpaired electrons.