Answer:
1: Negative ions, by gaining electrons to fill the valence shell
Explanation:
Nonmetals gain the electron to complete the octet and form anion. Consider the example of halogen.
When it combine with metals it gain the electron from the metal and form anion.
For example:
Sodium chloride is ionic compound. The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion. The electrostatic forces develop between bonded atoms.
Answer:
oxygen, water and sugar are the out come of photosynthesis
The flame test is commonly used to identify different metal ions by how they get excited in the presence of a flame.
Typically a nichrome wire is dipped in a solution of metal cations and then presented to a flame. The flame emits a different color than normal, depending on the type of metal cation. Each metal ion gets excited by the flame and as the electrons change energy levels they emit a photon of light, thus changing the color. Since each metal cation has unique energy levels, the colors differ depend on the metal cation.
I hope this helps.