Which of the following elements can Calcium (Ca) bond to ionically? (Select all that apply)
lodine (1)
Iron (Fe)
Hydrogen (H)
✓ Boron (B)
Nitrogen (N)
Radium (Ra)
Selenium (Se)

Iodine and Nitrogen

Explanation:

An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element or the metal and the element which accepts the electrons is known as electronegative element or non metal.

Calcium (Ca) being a metal will donate electrons to form a cation called as . Thus it will bond ionically to non metals which can form anions.

Iodine can form and Nitrogen can form , thus forming and respectively.

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.