Neutrons and isotopes

A neutral atom of Chlorine, Cl, has an atomic number of 17 and a mass of 35. How many subatomic particles are INSIDE the nucleus

• 17

• 35

• 18

• 52

Mass number is a measure of an atom's

• Electrons and protons

• Electrons and neutrons

• Neutrons and protons

• protons and atomic number

Which part of the atom has the most mass?

• the electrons

• the nucleus

• It is evenly spread out

• the neutrons

An atom with 19 protons, and 19 electrons and a mass of 39 has how many neutrons?

• 19
• 39
• 20
• 58

Tags

NGSS.MS-PS1-1

A phosphorus atom has 15 protons and 16 neutrons. What is the mass number?

• 15
• 16
• 31
• 1

What is the mass number for this Magnesium atom?

• 12

• 24

• 23

• 8

Tags

NGSS.MS-PS1-1

How many neutrons does a sodium atom have? (Use the image to help you)

• 23
• 11
• 12
• 34

Tags

NGSS.MS-PS1-1

What is the name of the pictured isotope?

• Chlorine-52

• Chlorine-17
• Chlorine-35
• Chlorine-18

Tags

NGSS.MS-PS1-1

If X is the symbol for an element, which of the following two symbols represent isotopes of the same element?     I. ⁷⁷₃₅X  II. ⁷⁷₃₃X  III. ⁸¹₃₇X   IV. ⁸¹₃₅ X

• I and II
• III and IV
• I and IV
• II and III

Two atoms of the same element but with different mass numbers are called________

• atoms

• isotopes
• atomic pair

• ions