Question

1 ;
matter in its simplest form is called an
2;there are what number of known elements​

Answer 1

Answer:

1:An element is the simplest form of matter that has a unique set of properties.

2:118 elements

At present, 118 elements are known to us. All these have different properties. Out of these 118, only 94 are naturally occurring. As different elements were being discovered, scientists gathered more and more information about the properties of these elements.

Answer 2

Answer:

1. An element is the simplest form of matter that has a unique set of properties. One element cannot be chemically converted to another element.

2.

Today, there are 118 elements on the periodic table, Four with atomic numbers – 113 (Nihonium), 115 (Moskovi), 117 (Tennesin) and 118 (Oganesson) – were added in 2016. With the discoveries of new elements, it's difficult to ascertain how long the table is going to be in the future.