The usage of these six timing-related adverbs may seem tricky at first but with some practice it will become second nature. Few notes:
- Before/Nachdem/Seitdem clearly separate state of thing before/after something happened. Seitdem usually relates to a singular event (short in time) while Nachdem could refer to time period after some other time period (or even epoch).
- The really tricky couple is wenn/als: wenn implies "whenever ..." while "als" implies "when exactly once...". See your examples below...
Ich bestelle...nachdem...
Ich hatte schon ... als ..
Während due den Tisch ...
Bevor ich dir das Foto ...
Als er las, saß er ... (could also be wenn depending what they mean to say)
Als wir noch klein waren ...
Immer wenn er zu uns kommt ...
Nachdem ich ihn ....
Seitdem er den Unfall ...
Als wir eintraten ...
Jedesmal wenn wir den alten ...
Seitdem ich die Schwarzmeerküste ...
Answer:
Water is made up of two hydrogen (H) atoms and one oxygen (O) atom. The formula for water is H2O. The hydrogen atoms have filled orbitals with two electrons and the oxygen atom is filled with eight electrons.
Explanation:
