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What is the charge of an ion that has 20 protons and 18 electrons?
Nucleus and electron energy levels
9
It has an electronic configuration of a noble gas
The nucleus must always contain protons and neutrons
+2
Density
48 protons, 64 neutrons, 48 electrons
Atom C; Mass no. 23; Atomic no. 1
A beryllium atom has 4 protons,5 neutrons,4 electrons. What is the mass no. of this atom?
Nucleus and electron energy levels
9
It has an electronic configuration of a noble gas
The nucleus must always contain protons and neutrons
+2
Density
48 protons, 64 neutrons, 48 electrons
Atom C; Mass no. 23; Atomic no. 1
Which of the following atoms A, B, C or D would form an ion with a charge of +1?
Nucleus and electron energy levels
9
It has an electronic configuration of a noble gas
The nucleus must always contain protons and neutrons
+2
Density
48 protons, 64 neutrons, 48 electrons
Atom C; Mass no. 23; Atomic no. 1
The two main parts of an atom are its:
Nucleus and electron energy levels
9
It has an electronic configuration of a noble gas
The nucleus must always contain protons and neutrons
+2
Density
48 protons, 64 neutrons, 48 electrons
Atom C; Mass no. 23; Atomic no. 1
An atom has an atomic number of 11. Which of the following statements is true?
Nucleus and electron energy levels
9
It has an electronic configuration of a noble gas
The nucleus must always contain protons and neutrons
+2
Density
48 protons, 64 neutrons, 48 electrons
Atom C; Mass no. 23; Atomic no. 1
An isotope of cadmium has an atomic no. of 48 and a mass no. of 112. This cadmium ion has:
Nucleus and electron energy levels
9
It has an electronic configuration of a noble gas
The nucleus must always contain protons and neutrons
+2
Density
48 protons, 64 neutrons, 48 electrons
Atom C; Mass no. 23; Atomic no. 1
Which of the following statements is not true about atoms?
Nucleus and electron energy levels
9
It has an electronic configuration of a noble gas
The nucleus must always contain protons and neutrons
+2
Density
48 protons, 64 neutrons, 48 electrons
Atom C; Mass no. 23; Atomic no. 1
Which of the following properties is the same for the isotopes of an element?
Nucleus and electron energy levels
9
It has an electronic configuration of a noble gas
The nucleus must always contain protons and neutrons
+2
Density
48 protons, 64 neutrons, 48 electrons
Atom C; Mass no. 23; Atomic no. 1
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