elements from the same group in the periodic table are chemically reactive in a similar way & elements are all from the first group of the periodic table -> escapes from the second person are chemically reactive in a similar highway 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 elements have similar chemical reactivity , then the elements will react with other elements in a similar way -> blubber from the second person will react with other arctic 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