Oxygen reacts 1:2 with sodium and is a colourless gas; chlorine reacts 1:1 with sodium and is a yellow gas; neon does not reacts with sodium and is a colourless gas. Suppose that a new element , pretendium, has been dicovered, and it is noted that this element reacts 1:1 with sodium and is bright green as a gas.
A) which chemical family would it belong to?
-I think halogens.
B) How many electrons would it have in its outermost shell?
-7?
I agree with halogens.
I don't agree with -7 electrons; I might agree with 7 electrons.
A) To determine the chemical family to which the element "pretendium" belongs, we can analyze its reactivity pattern with sodium and its color as a gas. The element reacts 1:1 with sodium, similar to chlorine. Chlorine belongs to the halogen family, which consists of elements that react with metals like sodium to form ionic compounds. Additionally, "pretendium" is described as a bright green gas, which aligns with the typical color of halogens. Therefore, your answer is correct; "pretendium" would belong to the halogen chemical family.
B) The number of electrons in the outermost shell of an element directly correlates to its position in the periodic table. Since "pretendium" belongs to the halogen family, it is in Group 17 of the periodic table. Group 17 elements, known as halogens, have seven electrons in their outermost shell. Therefore, your answer is correct; "pretendium" would have 7 electrons in its outermost shell.