اختبار ساينس Science - اولى اعدادي -مقرر اكتوبر -نموذج 2

fertilizer are chemical compounds used to improve the agricultural crops

Where is most of the mass of an atom located? 

The subatomic particle with a negative charge is the 

…….. formulated the first scientific theory about the atom its 

What does the atomic mass represent? 

In NPK fertilizer. The element needed to  developing strong roots is Nitrogen

How do you find the number of neutrons in an atom ? 

A neutral atoms has 85 protons and 125 neutrons What is its atomic number.........

Isotopes are the atoms of an element with different numbers of protons but the same number of neutrons 

The outmost energy level of any atom does not contain more than

Dalton formulated the first scientific theory about the atom,  showing that the atoms are divisible

The number of negative electrons in the atom in its normal state equals

The nucleus is the smallest part of the atom and takes up the least space

A neutral atoms has 85 protons and 125 neutrons What is its mass number

The atomic number is the same as the number of  

Ancient Greek philosophers believed that matter was made up of small, indivisible parts called Atoms

The number of electrons required to saturate the first four levels of energy can be determined by the mathematical relationship

A neutral atoms has 85 protons and 125 neutrons How many electrons does atoms has?  

When the elements differ between English and Latin name its symbol is taken from its 

The electrons are the lightest in weight of the three subatomic particles

How many electrons can each level hold? 

There are the same number of these two particles in an atom

Electrons are present in the nucleus

There are …….. main energy levels

The atomic number is the number of protons an atom contains 

In NPK fertilizer. The element necessary for healthy growth  of the plant is phosphorus

In NPK fertilizer. The element needed for the greening of plant leaves is: 

The atomic  number is represented by the symbol Z and is written at the  ….side of the element symbol

The fertilizer NPK composed of three compound containing the elements  

The subatomic particle with no electrical charge is the ........

The subatomic particle with a positive charge is the …………

The masses of subatomic components in the atomic mass units are measured in atomic mass units ( u)

The mass number is represented by the symbol A and is written at the ……….side of the element symbol

The mass of the electrons is neglected in calculation of the atomic mass

……..revolve around the nucleus at different energy level according to their energy