Answer the following:1. A is a set of elements that run from left to right. 2. Every element in the first period has shell for its . Every element in the second period has shells for its . How many shells will the third period have? 3. Groups are that run from top to bottom. 4. The elements of a group have the same number of in their shell. 5. Every element in group one has electron in its outer shell. Every element in group two has electrons in its outer shell. 6. The element that can act like it belongs to two groups is . Why?

1. Periods 2. One, electrons 3. Two, electrons 3. Elements 4. Electrons, outermost 5. One, two 6. Seven, six

Explanation: they needed one and two electrons to complete their outer shell, so the have same valence but negative.

. A period is a set of elements that run from left to right. 2. Every element in the first period has one__ shell for its ___electronic configuration structure. Every element in the second period has ___two___ shells for its ___electronic configuration structure__. How many shells will the third period have? The third period has 3 shells

3. Groups are elements___ that run from top to bottom. 4. The elements of a group have the same number of __electron in their ___valence___ shell. 5. Every element in group one has ___one___ electron in its outer shell. Every element in group two has ___two___ electrons in its outer shell. 6. The element that can act like it belongs to two groups is . Why

xplanation:

the answer is 1 i believe