Which of these sets of atomic numbers represents a period? A Li. Na. K a B, Sa.

Question

Which of these sets of atomic numbers represents a period? A Li. Na. K a B, Sa. Si C. B, O. Ne Co, P. S Elements C, Si, Ge. Sn, and Pb have similar. A Atomic numbers B. Atomic symbols C. States of matter D. Physical and chemical properties Highlight the element that has a mass number of 27. KS 5D_Recognize that chemical formulas are used to identify substances and determine number of atoms of each element in chemical formulas containing subscripts. 5E_Investigate how evidence of chemical reactions indicate that new substances rent properties are formed. whether the example is a physical or chemical reaction:

Explanation / Answer

1) c) B,O, Ne. Boron, oxygen, neon belongs to same period.

2) D ) physical and chemical properties

20) Mass number = # of protons + # of neutrons

Only Al has proton and neutron in such a way that their sum = 13+ 14= 27

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