1. Completaţi spaţiile libere:
a) Ionii pozitivi se obţin din atomi prin…………….. de electroni.
b) Într-un ion negativ, numărul de electroni din învelişul electronic este
mai decât numărul de protoni din nucleu.
c) În perioadă, odată cu electronegativităţii de la grupa 1 la grupa 17,
caracterul metalic şi caracterul nemetalic.
d) În grupa 17,odată cu creşterea electronegativităţii de la perioadala
perioada, caracterul nemetalic.
e) Metalele cu caracter puternic electropozitiv au electronegativităţi…………….
f) Metalele au electronegativităţi mai………… decît 1,7
g) Nemetalele cu caracterul electronegativ cel mai accentuat au cele mai
electronegativităţi.
h) Electronegativitatea în grupă de la perioada 2 la perioada 6.
i) Într-o perioadă, metalul alcalin are electronegativitatea cea mai,iar
halogenul are electronegativitatea cea mai
2. Se considereă următoarele elemente şi electronegativităţile lor: Fe(1,8), Zn (1,6),S
(2,5) Br (2,8).Indicaţi care dintre elemente sunt metale şi care sunt nemetale.
3. Indicaţi care reacţii sunt posibile şi completaţi ecuaţiile reacţiilor posibile:
a) Cl 2 +MgBr 2 →
b) Br 2 +NaCl →
c) Mg +CuCl 2 →
d) Cu +MgCl 2 →
e) Cl 2 +KBr→
f) Cl 2 +KF→
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