electronegativity
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片预览 (8 张)
def.
the relative power of an atom to attract the shared pair of electrons in a covalent bond
trends
increasing across periodsdecreasing down groups
why does it increase across periods
nuclear charge increases, shielding stays the same and atomic radius decreases
why does it decrease down groups
nuclear charge increases, BUT shielding increases and atomic radius increases.
what is a polar covalent bond
a polar covalent bond arises when electron density is not equally shared, therefore shared pair of electrons not equally shared, therefore partial charges arise
when do polar bonds also arise
when there is a difference win electronegativity between fused atoms
Suggest why the electronegativity of the elements increases from lithium to fluorine.
More protons / bigger nuclear chargeSame or similar shielding / electrons in the same shell or principal energy level / atoms get smaller
Although phosphine molecules contain hydrogen atoms, there is no hydrogen bonding between phosphine PH3 molecules.Suggest an explanation for this.
Difference in electronegativity between P and H is too small