1. The metallic ions such as (choose between anions and cations) are positively
ID: 559314 • Letter: 1
Question
1. The metallic ions such as (choose between anions and cations) are positively electrons to the nonmetallic ions. charged because they have given up their Which of the following ceramic materials has the highest percent ionic character? (select one among SiC, ZnS, Si3N4, NaCl, and Mgo) 2. 3. Rock salt (Sodium Chloride) and Cesium Chloride are both having the AX type crystal structure. What differentiates them in their crystal structures and when one computes the cation to anion radius What is to be determined ratio? 4. 5. Name two material that are having Zine Blende crystal structure and 6. What type of crystal structure type that Barium Titanate (BaTiO3) is classified under? 7. Show the chemical formula of silicate (hint: Silica is SiO))Explanation / Answer
1. The metallic ions such as Na+, Mg+2, Ca+2 are positevely charged because they have have given up their valance electrons to non metallic ions .
2. The ceramic material MgO has the highest ionic percentage
exp: the greater the difference in electronegativity of elements , the larger the ionic charecter.
MgO has 70% ionic charecter, NaCl 59%, SiC and ZnS are covalent.
3.their coordination number different CsCL 8:8 and NaCl 6:6, radious ratio is different for these two crystals.
4. coordination numbers and ionic sizes
5. lead (II) nitrate ,, gallium arsenide are two compounds that have zinc blend like structures.
6. AmBnXp type crystal
7.chemical formula of silicate SiO4-4
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