Chemistry - 4CH1 PearsonEdexcel

Ionic Bonding

Gbogbo ọrọ náà

Table salt, limestone, rust - all of these familiar substances are held together by ionic bonds. When a metal atom transfers one or more electrons to a non-metal atom, both achieve stable outer shells and the resulting oppositely charged ions lock into a rigid lattice held by powerful electrostatic attraction.

This lesson explains how ions form, how to predict their charges from the periodic table, how to write ionic formulae, and how to draw dot-and-cross diagrams. You will also learn why ionic compounds have high melting points and why they only conduct electricity when molten or dissolved.

Ebumnobi

understand how ions are formed by electron loss or gain
know the charges of these ions: - metals in Groups 1, 2 and 3 - non-metals in Groups 5, 6 and 7 - Ag+, Cu2+, Fe2+, Fe3+, Pb2+, Zn2+ - hydrogen (H+), hydroxide (OH-), ammonium (NH4+), carbonate (CO32-), nitrate (NO3-), sulfate (SO42-).
write formulae for compounds formed between the ions listed above
draw dot-and-cross diagrams to show the formation of ionic compounds by electron transfer, limited to combinations of elements from Groups 1, 2, 3 and 5, 6, 7 only outer electrons need be shown
understand ionic bonding in terms of electrostatic attractions
understand why compounds with giant ionic lattices have high melting and boiling points
know that ionic compounds do not conduct electricity when solid, but do conduct electricity when molten and in aqueous solution

Akọmọ Ojú-ẹkọ

Metals sit on the left of the periodic table with just one, two or three electrons in their outer shell. Non-metals on the right need only a few more electrons to fill theirs. The solution is elegant: metals donate their outer electrons to non-metals, and the electrostatic pull between the resulting positive and negative ions creates one of the strongest types of chemical bond.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Ionic Bonding. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

What type of particle is formed when a sodium atom loses one electron? A) A negative ion B) A positive ion C) A molecule D) A neutral atom Answer: B
What is the charge on an oxide ion? A) 1+ B) 2+ C) 1- D) 2- Answer: D
Which of these ionic compounds has the formula MgCl2? A) Magnesium carbonate B) Magnesium chloride C) Manganese chloride D) Magnesium oxide Answer: B
Ionic compounds conduct electricity when molten because: A) The electrons are free to move B) The ions are free to move C) The molecules break apart D) The covalent bonds break Answer: B
In a dot-and-cross diagram for NaCl, the chloride ion is shown with: A) 7 outer electrons B) 8 outer electrons C) 1 outer electron D) No outer electrons Answer: B