Which is false- 1. Columns in a periodic table represent the number of valence electrons an element has?

2. Elements in the same row of the periodic table have similar chemical properties.


3. The group of elements called halogens is found to the right of the periodic table


4. Elements to the left of the periodic table usually form positively charged ionsWhich is false- 1. Columns in a periodic table represent the number of valence electrons an element has?
The answer is #2.





1 is TRUE because the number of valence electrons is related to the group or column the element is in.





3 is TRUE because the halogens are the group directly to the right of the noble/inert gases and have 7 valence electrons.





4 is TRUE because common cations (positive ions) involving the left elements include Ca, Na, H, etc.





2 is FALSE because elements are categorized into groups (columns) which have similar characteristics.Which is false- 1. Columns in a periodic table represent the number of valence electrons an element has?
What I have known so far about the arrangement of elements in the periodic table is the elements in the periodic table are arranged in an increasing order of proton number , ranging from 1 to 113. Each vertical columns are known as Group 1 to Group 18. Each horizontal rows is called period. The horizontal rows are known as Period 1 - Period 7 .The period of an element is equal to the number of shells occupied with electrons in the electron of the element.





For example :


Sodium and magnesium form basic metal oxides whereas alumiun forms amphoteric oxide . On the other hand , silicon , phosphorus , sulphur and chlorine form acidic non-metal oxides. Refer to the Periodic Table and you'll see the differences of the atom arrangement. I suggest that you do a lot of exercise on it and try to ask your teacher for further details .
1. True


2. false


3.true


4. true
2


Elements in the same column have similar properties.