Mendeleev used his arrangement of elements in order of increasing mass and repeated properties to predict the mass and properties of undiscovered elements. true or false

True.

Elements are arranged by Mendeleev according to increasing mass in rows to put the elements with similar properties in the same column. Due to undiscovered elements, he was unable to make the complete table, but he left some gaps to put the new elements after their discoveries. In this way, properties of new elements can be identified by arranging the elements in increasing order of mass and repeated properties.

Therefore, the statement "Mendeleev used his arrangement of elements in order of increasing mass and repeated properties to predict the mass and properties of undiscovered elements" is true.

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.