Sodium chloride comprises 97%-99% of table salt. given their location on the periodic table, identify the ionic charge for each element and predict the chemical formula of the compound formed. a) sodium, na, is an alkali metal and is in group ia with an ionic charge of +1. while chlorine, cl, is a halogen and is in group viia with a charge of -1. these will form nacl(s). b) sodium, na, is an alkaline earth metal and is in group ia with an ionic charge of +2. while chlorine, cl, is a halogen and is in group viia with a charge of -1. these will form nacl2(s). c) sodium, na, is an alkali earth metal and is in group ia with an ionic charge of +2. while chlorine, cl, is a noble gas and is in group via with a charge of -2. these will form na2cl2(s). d) sodium, na, is an alkali earth metal and is in group ia with an ionic charge of +1. while chlorine, cl, is a diatomic gas and is in group via with a charge of -2. these will form na2cl(s).

Answer is: A)Sodium, Na, is an alkali metal and is in Group IA with an ionic charge of +1. While chlorine, Cl, is a halogen and is in Group VIIA with a charge of -1. These will form NaCl(s).

Table salt is sodium chloride mixed with small amount of potassium iodide (KI), sodium iodide (NaI) or sodium iodate (NaIO₃).

Atomic level - sodium chloride (NaCl) has crystal cubic structure (lattice-type arrangement) with ionic bonds. Sodium is cation with charge 1+ and chlorine is an anion with charge 1-.

Macroscopic level - table salt is colorless crystal, soluble in water with high melting and boiling temperature.

Ionic compounds are good good electricity and heat conductors, because ionic compounds have mobile ions (cations and anions) that are able to transfer electrical charge.

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assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.