Use the periodic to fill in the numbers in the electron configurations shown below. b: 1s2 2sa2pb

Explanation:

Atomic number of boron is 5 and its electronic configuration is . Boron is a non-metal and belongs to group 13.

That is, 2s shell of boron atom contains 2 electrons and 2p shell of the atom has 1 electron.

Therefore, we can conclude that the value of A equals 2 and value of B equals 1 in B: 1s2 2sA2pB.

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.