MCQ
Which is the most common oxidation state for thorium in its compounds?
- A+2
- B+5
- C+3
- ✓+4
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i. Depolarization of atrial muscles.
ii. Activation of SA-node.
iii. Spread of excitation from AV node to SA node.
iv. Repolarization of atria and depolarization of ventricles.