an atom with a high electronegativity, like fluorine
Polar
If this difference is under 2 the bond is covalent; if the difference is over 2 the bond is ionic.
The CaCl bond would be polar ionic.
Two fluorine atoms. the formula of calcium fluoride is CaF2.
Covalent. There is no electronegativity difference between two atoms of the same element.
Ionic bond, as the difference in electronegativity between calcium and fluorine is over 1.7
The difference in electronegativity between th atoms foming the covalent bond leads to the polar nture of the bond. If the atoms are alike then there is NO difference in electronegativity- so - no bond polarity
If there is a slight electronegativity difference, the bond is a nonpolar covalent bond. If there is a large electronegativity difference, it is an ionic bond. If the difference is somewhere between, it is a polar covalent bond.
Polar
Calcium is a metal with an electronegativity of 1.0 and oxygen is a nonmetal with an electronegativity of 3.5. The electronegativity difference is 2.5, and anything over 1.7 indicates an IONIC BOND.
A covalent bond is where the two atoms share electrons. A difference of electronegativity of less than 1.7 is likely to be covalent. Electronegativity is a measure of the atoms ability to attract electrons, so if their is a larget difference one will remove if from the other making two ions and an ionic bond. While if it is small neither has the strength to take it completely away from the other making the bonds covalent.Chloride has electronegativity of 3.16 while Calcium is only 1.00, making it an ionic bond.http://en.wikipedia.org/wiki/Electronegativity
A covalent bond occurs when there is a large difference in electronegativity between two atoms for example. Fluorine is very electronegative (as it is a non metal) and Hydrogen is not as electronegative. in fact there is a large difference in the electronegativity values. Therefore, a covalent bond occurs.
A covalent bond is formed between two atoms with similar electronegativity.
Calcium is a metal with an electronegativity of 1.0 and oxygen is a nonmetal with an electronegativity of 3.5. The electronegativity difference is 2.5, and anything over 1.7 indicates an IONIC BOND.
Polar covalent bond.
The greater the electronegativity difference between the two bonded atoms, greater is the ionic character of the bond.
Look at the atoms involved in the bond. Then look at the electronegativity values of the atoms involved. The stronger the en value of the atoms the stronger the bond is and the more "ionic" the bond is.