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1.All transition metals and rare earth metals act as positives in ionic bonding.

2.?

3.Substances with covalent bonds often form molecules with low melting and boiling points, such as hydrogen and water. The slideshow shows a covalent bond being formed between a hydrogen atom and a chlorine atom, to form hydrogen chloride. 1. A hydrogen atom with one electron and a chlorine atom with 17 electrons

Explanation:

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we need the questions , i may then you.

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.