Question

question 7. complete the table showing the number of protons and electrons in atoms of six elements.
element name
element symbol
atomic number
number of protons
number of electrons
hydrogen h 1
helium he 2
lithium li 3
boron b 5
carbon c 6
oxygen o 8

Explanation:

Step1: Recall atomic number property

In a neutral atom, the number of protons is equal to the atomic number and the number of electrons is equal to the number of protons.

Step2: Fill for Hydrogen

Atomic number of hydrogen is 1. So number of protons = 1 and number of electrons = 1.

Step3: Fill for Helium

Atomic number of helium is 2. So number of protons = 2 and number of electrons = 2.

Step4: Fill for Lithium

Atomic number of lithium is 3. So number of protons = 3 and number of electrons = 3.

Step5: Fill for Boron

Atomic number of boron is 5. So number of protons = 5 and number of electrons = 5.

Step6: Fill for Carbon

Atomic number of carbon is 6. So number of protons = 6 and number of electrons = 6.

Step7: Fill for Oxygen

Atomic number of oxygen is 8. So number of protons = 8 and number of electrons = 8.

Answer:

Element Name	Element Symbol	Atomic Number	Number of Protons	Number of Electrons
Helium	He	2	2	2
Lithium	Li	3	3	3
Boron	B	5	5	5
Carbon	C	6	6	6
Oxygen	O	8	8	8