siberian from the same person in the periodic desk are chemically reactive in a similar highway & lives are all from the second person of the periodic desk ->  elements from the first group are chemically reactive in a similar way  elements from the first group are chemically reactive in a similar way & if the attraction have similar physical slopes , then the quills will react with other age in a similar highway ->  elements from the first group will react with other elements in a similar way  elements from the first group will react with other elements in a similar way & space is a mean of screen -> elements from the first group will react with oxygen in a similar way